Coolant Additive – Gas & Diesel: VP Cool Down™


Cool Down is safe for all gas and diesel radiator systems. It reduces engine temperatures by up to 30°F and improves the flow of coolant. We formulate it for use with today’s OAT and HOAT-formula engine coolants.



Product Description

VP Racing Cool Down™ coolant additive is proven to reduce your engine temps (by up to 30°F) & cylinder head temps (by up to 75°F) while improving coolant flow. It works for gas and diesel engines & is safe for all radiator systems. Cool Down is ideal for your racing and street vehicles, RV, & towing applications.

Our coolant additive lubricates all vital components & is approved by most race-sanctioning bodies. Just one 16-Oz. bottle treats 12-20 quart cooling systems. If you run straight water in your system, we recommend adding 50% more Cool Down. When using as a diesel coolant additive, use twice the usual amount of product to protect wet sleeve cylinder liners. For powersports vehicles, you'll want to use 2 oz. of Cool Down for every quart of coolant.

VP Cool Down treatments last one year or 30,000 miles, whichever comes first. We do suggest changing your coolant every two years.

Take a look at what happened when Engine Labs put Cool Down to the test on a 2006 C6 Corvette.


  • Reduces cylinder head temps by up to 75°F and overall coolant temps by up to 30°F
  • Improves coolant flow for better heat transfer
  • Lubricates all vital components
  • Protects sensitive aluminum alloys


  • Can you mix this additive with antifreeze? Yes, you can. Cool Down works great with antifreeze. It is formulated for use with today’s OAT and HOAT-formula engine coolants. We recommend changing your coolant every 2 years.
  • How do I use Cool Down™? Just open the bottle and add the contents straight into the radiator or coolant reservoir. If you have access to a radiator cap, pouring Cool Down directly into the radiator is the preferred method. One 16 oz. bottle will treat cooling systems of 12-20 quarts.
  • Will your coolant additive work in cold weather climates? If used as directed, it shouldn’t disrupt the freeze protection provided by traditional antifreeze that contains glycol.
Customer Reviews
Rating: 4 stars
Source: Reviewed on
I've only used Water Wetter in the past and only tried this because the other wasn't available. VP Racing have high quality products and this is definitely one of them. I can definitely recommend this as an equal replacement for Water Wetter. It's you've got a high compression turbocharged engine you definitely should be using this product. Especially if you live in a warm climate or you run the car hard.
Rating: 5 stars
Source: Reviewed on
It does what is claims! With the outside temps going well into the 90s, my car seemed a little hot, choking for air. The coolant was running at 196 degrees at its peak (normal for my car), but my air intake was reading up to 158 degrees. Hot air is no good, so I thought I would try this to lower the overall temperature in the engine bay. It worked!! With my coolant topping off at about 190 degrees, my air intake temp dropped to about 118 degrees at peak. The engine response was noticeable right away!
Rating: 5 stars
Source: Reviewed on
Works as advertised I added this to a 2000 Ford Explorer 4.0L. The Engine temp ran a consistent 196-201 deg F. After adding this and driving it with the heater on as directed I noticed the engine temp gauge was lower than its usual position. I turned off the heater thinking perhaps the heat draw was lowering the temp. But after driving it another 5 miles the gauge never rose back to its normal position. After 2 days of running the vehicle in the Arizona heat it is still in the same spot. Hooked up an OBD II reader and it read the engine temp at 185 deg F. That’s a whole 11-16 deg cooler than just antifreeze alone. This product does work as advertised. I will put it in again once I perform a coolant change.

Additional information

Additional information

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