Best Cooling System Additives. Reviews September, 2020

Red Line (80204) Water Wetter - Coolant Additives - 12 Oz Bottle

Search only Red Line brand name
Red Line (80204) Water Wetter - Coolant Additives - 12 Oz Bottle

Current price: 9.99 USD


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Height: 8.5 Inches

Length: 11 Inches

Width: 9 Inches

Weight: 0.7495716908 Pounds

  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling

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Royal Purple ROY01600 PURPLE ICE SUPER COOLANT, 12 oz, 1 Pack

Search only Royal Purple brand name
Royal Purple ROY01600 PURPLE ICE SUPER COOLANT, 12 oz, 1 Pack

Current price: 12.99 USD

Saving: $3.00 (19%)


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Height: 7.5 Inches

Length: 3.75 Inches

Width: 1.14 Inches

Weight: 0.75 Pounds

Warranty: N

  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION

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Ford Genuine Fluid VC-8 Diesel Cooling System Additive - 16 oz. (2)

Search only Ford brand name
Ford Genuine Fluid VC-8 Diesel Cooling System Additive - 16 oz. (2)

Current price: 20.36 USD


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Weight: 1 Pounds

  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION

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Lubegard 96001 Kool-It Supreme Coolant Treatment, 16 oz.

Search only Lubegard brand name
Lubegard 96001 Kool-It Supreme Coolant Treatment, 16 oz.

Current price: 14.56 USD


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Height: 2.1 Inches

Length: 8.1 Inches

Width: 3.1 Inches

  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION
  • Only coolant protectant with built-in pH indicator; pH indicator for use in straight water applications
  • Prevents deposits and contamination which lead to overheating
  • Enhances heat transfer and reduces operating temperatures
  • Provides unsurpassed cooling system corrosion protection
  • Protects all metals from chemical electrolysis

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Bar's Leaks Cooling System Repair - 16.9 oz

Search only Bar's Leaks brand name
Bar's Leaks Cooling System Repair - 16.9 oz

Current price: 8.88 USD

Saving: $4.11 (32%)


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Height: 8.4 Inches

Length: 1.8 Inches

Width: 3.6 Inches

Warranty: No

  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION
  • Only coolant protectant with built-in pH indicator; pH indicator for use in straight water applications
  • Prevents deposits and contamination which lead to overheating
  • Enhances heat transfer and reduces operating temperatures
  • Provides unsurpassed cooling system corrosion protection
  • Protects all metals from chemical electrolysis
  • Premium carbon fiber formulation for extended protection
  • Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow (OAT/HOAT) coolant
  • Stops cooling system leaks

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Motorcraft VC8 Diesel engine coolant additive - 1 Pint(473 ml)

Search only Motorcraft brand name
Motorcraft VC8 Diesel engine coolant additive - 1 Pint(473 ml)

Current price: 19.72 USD


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Weight: 1 Pounds

  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION
  • Only coolant protectant with built-in pH indicator; pH indicator for use in straight water applications
  • Prevents deposits and contamination which lead to overheating
  • Enhances heat transfer and reduces operating temperatures
  • Provides unsurpassed cooling system corrosion protection
  • Protects all metals from chemical electrolysis
  • Premium carbon fiber formulation for extended protection
  • Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow (OAT/HOAT) coolant
  • Stops cooling system leaks
  • Now dyed yellow to eliminate engine coolant color change when mixing
  • Designed to replace additives depleted between coolant change-outs
  • In all heavy-duty, diesel engine cooling systems equipped with yellow-colored Motorcraft Premium Gold Engine Coolant meeting Ford Specification WSS-M97B51-A1
  • In all heavy-duty, diesel engine cooling systems equipped with green-colored Motorcraft Premium Engine Coolant meeting Ford Specification ESE-M97B44-A

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Hy-Per Lube HPC100-3PK High Performance Super Coolant - 16 oz, (Pack of 3)

Search only Hy-Per Lube brand name
Hy-Per Lube HPC100-3PK High Performance Super Coolant - 16 oz, (Pack of 3)

Current price: 27.77 USD


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  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION
  • Only coolant protectant with built-in pH indicator; pH indicator for use in straight water applications
  • Prevents deposits and contamination which lead to overheating
  • Enhances heat transfer and reduces operating temperatures
  • Provides unsurpassed cooling system corrosion protection
  • Protects all metals from chemical electrolysis
  • Premium carbon fiber formulation for extended protection
  • Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow (OAT/HOAT) coolant
  • Stops cooling system leaks
  • Now dyed yellow to eliminate engine coolant color change when mixing
  • Designed to replace additives depleted between coolant change-outs
  • In all heavy-duty, diesel engine cooling systems equipped with yellow-colored Motorcraft Premium Gold Engine Coolant meeting Ford Specification WSS-M97B51-A1
  • In all heavy-duty, diesel engine cooling systems equipped with green-colored Motorcraft Premium Engine Coolant meeting Ford Specification ESE-M97B44-A
  • Compatible With All Types of Antifreeze, does not contain ethylene glycol
  • Complete Protection from Rust, Corrosion and Electrolysis
  • Prevents Overheating in High Performance and High Load Engines
  • Allows Safe Advancement of Ignition Timing Resulting in More Horsepower
  • Reduces Engine Cylinder Heat Temperatures

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Hayden Automotive 525 Remote Transmission Oil Cooling System

Search only Hayden Automotive brand name
Hayden Automotive 525 Remote Transmission Oil Cooling System

Current price: 105.99 USD


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Height: 4.3 Inches

Length: 19 Inches

Width: 11.4 Inches

Weight: 5.15 Pounds

Warranty: 1 year or 12K Miles

  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION
  • Only coolant protectant with built-in pH indicator; pH indicator for use in straight water applications
  • Prevents deposits and contamination which lead to overheating
  • Enhances heat transfer and reduces operating temperatures
  • Provides unsurpassed cooling system corrosion protection
  • Protects all metals from chemical electrolysis
  • Premium carbon fiber formulation for extended protection
  • Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow (OAT/HOAT) coolant
  • Stops cooling system leaks
  • Now dyed yellow to eliminate engine coolant color change when mixing
  • Designed to replace additives depleted between coolant change-outs
  • In all heavy-duty, diesel engine cooling systems equipped with yellow-colored Motorcraft Premium Gold Engine Coolant meeting Ford Specification WSS-M97B51-A1
  • In all heavy-duty, diesel engine cooling systems equipped with green-colored Motorcraft Premium Engine Coolant meeting Ford Specification ESE-M97B44-A
  • Compatible With All Types of Antifreeze, does not contain ethylene glycol
  • Complete Protection from Rust, Corrosion and Electrolysis
  • Prevents Overheating in High Performance and High Load Engines
  • Allows Safe Advancement of Ignition Timing Resulting in More Horsepower
  • Reduces Engine Cylinder Heat Temperatures
  • Can be operated with thermostatic or manual controls
  • Advanced stator fan design to evenly distribute cooling
  • Threaded cooler fittings for maximum dependability
  • Self contained cooler/fan combination for remote mounting
  • Tube and fin design

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SUBARU Genuine Cooling System Conditioner Coolant Head Gasket 12 Pack Case SOA635071

Search only Subaru brand name
SUBARU Genuine Cooling System Conditioner Coolant Head Gasket 12 Pack Case SOA635071

Current price: 35 USD


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  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION
  • Only coolant protectant with built-in pH indicator; pH indicator for use in straight water applications
  • Prevents deposits and contamination which lead to overheating
  • Enhances heat transfer and reduces operating temperatures
  • Provides unsurpassed cooling system corrosion protection
  • Protects all metals from chemical electrolysis
  • Premium carbon fiber formulation for extended protection
  • Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow (OAT/HOAT) coolant
  • Stops cooling system leaks
  • Now dyed yellow to eliminate engine coolant color change when mixing
  • Designed to replace additives depleted between coolant change-outs
  • In all heavy-duty, diesel engine cooling systems equipped with yellow-colored Motorcraft Premium Gold Engine Coolant meeting Ford Specification WSS-M97B51-A1
  • In all heavy-duty, diesel engine cooling systems equipped with green-colored Motorcraft Premium Engine Coolant meeting Ford Specification ESE-M97B44-A
  • Compatible With All Types of Antifreeze, does not contain ethylene glycol
  • Complete Protection from Rust, Corrosion and Electrolysis
  • Prevents Overheating in High Performance and High Load Engines
  • Allows Safe Advancement of Ignition Timing Resulting in More Horsepower
  • Reduces Engine Cylinder Heat Temperatures
  • Can be operated with thermostatic or manual controls
  • Advanced stator fan design to evenly distribute cooling
  • Threaded cooler fittings for maximum dependability
  • Self contained cooler/fan combination for remote mounting
  • Tube and fin design
  • 1990-2008 LEGACY and Outback
  • 1998-2008 Forester
  • 1993-2008 Impreza Wrx STI
  • Subaru Genuine Coolant Cond. SOA635071 X12 ( Case discount)
  • Used only with cars with green coolant .

More Info

Bar's Leaks J-100 DiFM Cooling System Treatment - 5 Grams

Search only Bar's Leaks brand name
Bar's Leaks J-100 DiFM Cooling System Treatment - 5 Grams

Current price: 22.61 USD

Saving: $7.39 (25%)


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Height: 3.6 Inches

Length: 6.6 Inches

Width: 3.6 Inches

Warranty: 1 year manufacturer

  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Fit type: Vehicle Specific
  • Contains lubricants to protect the water pump
  • Compatible with all coolants types
  • Prevents erosion and electrolysis
  • OPTIMIZES PROTECTION
  • Only coolant protectant with built-in pH indicator; pH indicator for use in straight water applications
  • Prevents deposits and contamination which lead to overheating
  • Enhances heat transfer and reduces operating temperatures
  • Provides unsurpassed cooling system corrosion protection
  • Protects all metals from chemical electrolysis
  • Premium carbon fiber formulation for extended protection
  • Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow (OAT/HOAT) coolant
  • Stops cooling system leaks
  • Now dyed yellow to eliminate engine coolant color change when mixing
  • Designed to replace additives depleted between coolant change-outs
  • In all heavy-duty, diesel engine cooling systems equipped with yellow-colored Motorcraft Premium Gold Engine Coolant meeting Ford Specification WSS-M97B51-A1
  • In all heavy-duty, diesel engine cooling systems equipped with green-colored Motorcraft Premium Engine Coolant meeting Ford Specification ESE-M97B44-A
  • Compatible With All Types of Antifreeze, does not contain ethylene glycol
  • Complete Protection from Rust, Corrosion and Electrolysis
  • Prevents Overheating in High Performance and High Load Engines
  • Allows Safe Advancement of Ignition Timing Resulting in More Horsepower
  • Reduces Engine Cylinder Heat Temperatures
  • Can be operated with thermostatic or manual controls
  • Advanced stator fan design to evenly distribute cooling
  • Threaded cooler fittings for maximum dependability
  • Self contained cooler/fan combination for remote mounting
  • Tube and fin design
  • 1990-2008 LEGACY and Outback
  • 1998-2008 Forester
  • 1993-2008 Impreza Wrx STI
  • Subaru Genuine Coolant Cond. SOA635071 X12 ( Case discount)
  • Used only with cars with green coolant .
  • Lubricates water pump seal
  • Helps control electrolysis and helps neutralize pH imbalance
  • Inhibits the formation of rust and scale
  • Stops radiator tank seal leaks
  • Seals internal, external and coolant to oil leaks

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