Top 10 Engine Coolant Additives
for January 2023

MOOZ's editors independently choose recommendations. Purchases made through our links may earn us commissions.

1
9.6
SCORE
Design Engineering 040200 Radiator Relief Coolant Additive for All Water Cooled Engines, 16 oz.

Design Engineering 040200 Radiator Relief Coolant for Additive All Water Cooled Engines

by Design Engineering
What We like

Fit type: Vehicle Specific

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Product Features

  • No mixing required; just add to cooling system and reduce engine operating temperature up to 30 degrees Fahrenheit
  • Safe with all alloys - 100% biodegradable, non-corrosive and non-toxic additive
  • Compatible with water and all anti-freeze mixtures
  • Formulated with a corrosion inhibitor and reduces pre-existing scale build-up
  • For use in all water cooled engines
2
9.6
SCORE
Motorcraft VC8 Diesel engine coolant additive - 1 Pint(473 ml)

Motorcraft VC8 Diesel coolant engine additive

by Motorcraft
What We like

Designed to replace additives depleted between coolant change-outs

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Product Features

  • In all heavy-duty, diesel engine cooling systems equipped with green-colored Motorcraft Premium Engine Coolant meeting Ford Specification ESE-M97B44-A
  • In all heavy-duty, diesel engine cooling systems equipped with yellow-colored Motorcraft Premium Gold Engine Coolant meeting Ford Specification WSS-M97B51-A1
  • Now dyed yellow to eliminate engine coolant color change when mixing
3
9.5
SCORE
Engine Ice TYDS008 High Performance Coolant - 0.5 Gallon

Engine Ice TYDS008 Performance High Coolant

by Engine Ice
What We like

Engine Ice hi-performance coolant is legal in CCS and ASRA road racing and permitted at many tracks around the world. Easy to Use Premixed with deionized water for out-of-the-bottle use.

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Product Features

  • Engineered to keep your operating temperatures at optimum performance to not lose power through excess heat; Engine Ice is safe for aluminum and most all metals
  • Engine Ice hi-performance coolant is biodegradable, phosphate free and non-toxic, typically reduces operating race temperatures and effectively keeping boil over temperatures to 256 Fahrenheit or less and freeze-up protection to -26 Fahrenheit
  • With an average reduction in operating temperatures of 10 Fahrenheit - 20 Fahrenheit Engine Ice is perfect for racing or street, motorcycle or auto, ATV or snow machine
  • Uses propylene glycol, which has been proven to eliminate water pump gasket and seal failures; it has also shown in high load, high stress conditions to reduce operating temperatures more than standard coolants
4
9.2
SCORE
Keyser’s Pro Blend 40 Below - Engine Coolant Additive, Powerful Radiator Water treatment - Antifreeze Coolant Concentrate Additive - Compatible With Most Antifreeze Coolant

Pro-Blend Keyser’s Pro 40 Blend Below

by Keyser's ProBlend
What We like

coolant, radiator, 40 degrees, problend, nascar, additive, reduce temperature

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5
8.8
SCORE
Royal Purple 01600 Purple Ice Super-Coolant Radiator Additive - 12 oz.

Royal Purple 01600 Purple Super-Coolant Ice Radiator Additive

by Royal Purple
What We like

Fit type: Vehicle Specific

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Product Features

  • Compatible with all coolants types
  • OPTIMIZES PROTECTION
  • Contains lubricants to protect the water pump
  • Prevents erosion and electrolysis
6
8.6
SCORE
Red Line (80204) Water Wetter - Coolant Additives - 12 Oz Bottle

Red Line (80204) Water Wetter

by Red Line
What We like

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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Product Features

  • 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
  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • 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
7
7.5
SCORE
Genuine Ford Fluid VC-12 Orange Specialty Revitalizer Engine Coolant - 1 Quart

Genuine Ford Fluid VC-12 Specialty Orange Revitalizer Engine Coolant

by Ford
What We like

Designed to replenish the corrosion inhibitors specific to Motorcraft orange antifreeze/coolant which may deplete with time between engine coolant change-outs

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Product Features

  • Do not mix different colors or types of coolant in your vehicle
  • Do not mix different colors or types of coolant in your vehicle
  • Use according to owner guide recommendations
  • May be added up to two times over the life of the engine antifreeze/coolant
8
7.2
SCORE
Mishimoto - MMRA-LC-5050F Liquid Chill Synthetic Engine Coolant, Premixed

Mishimoto

by Mishimoto
What We like

Premixed coolant provides year-round protection

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Product Features

  • Reduces engine wear and inhibits corrosion
  • Protects against boil over to 265F and freezing to -26F
  • Safe for all radiators and all gas/diesel engines
9
7.2
SCORE
Motorcraft Ford Diesel Coolant Additive VC8 - 3 Bottles

Motorcraft Ford Diesel Additive Coolant VC8

by Ford
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10
7.2
SCORE
STAR BRITE Star-Cool Premium Synthetic PG Engine Coolant - 1 Gallon

STAR BRITE Star-Cool Premium PG Synthetic Engine Coolant

by Star brite
What We like

Non-toxic - Does not contain ethylene glycol

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Product Features

  • PCT additive package maintains engine temperature to develop maximum horsepower
  • Reduces operating temperatures faster than other coolants
  • Meets or exceeds all OEM and appropriate ASTM specs
  • Formulated to seal pinhole leaks or fissures

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