10 Best Coolant Additive of December 2025

• Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
• 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
• 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
• Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises

Red Line

Red Line

Cummins Filtration

Prestone

• 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
• Designed to replace additives depleted between coolant change-outs
• Now dyed yellow to eliminate engine coolant color change when mixing

Motorcraft

• Formulated to prevent future corrosion and reduce existing build-up
• Decreases high coolant temperatures and does not require mixing
• Net Weight: 4 fl oz. / Note: Non-corrosive 100% recyclable
• Truck & SUV: 2 bottles / Sport Compact Cars: 1 bottle / ATV & Dirt Bike: 1oz per qt
• Mishimoto Lifetime Warranty
• Net Weight: 4 fl. oz./118ml
• Non-corrosive
• 100 percent recyclable
• Made in USA

Mishimoto

• Package Dimensions: 10.16 cms (L) x 5.08 cms (W) x 6.096 cms (H)
• Product Type: Auto Part
• Package Quantity: 1
• Country Of Origin: China

Wix

• Replaces fluorescent green-colored V119 premium antifreeze/coolant meeting Ford specification ESE-M97B44-A
• Replaces yellow-colored Motorcraft gold antifreeze/coolant meeting Ford specification WSS-M97B51-A1
• Designed to replace additives depleted between coolant change-outs
• Now dyed yellow to eliminate engine coolant color change when mixing
• Genuine OEM

Ford

• OPTIMIZES PROTECTION
• Prevents erosion and electrolysis
• Compatible with all coolants types
• Contains lubricants to protect the water pump
• Fit type: Vehicle Specific

Royal Purple