Adding WD40 to Gas

by Jen Davis
David De Lossy/Photodisc/Getty Images

WD-40 is a lubricant that has a number of uses, including lubrication, cleaning and rust prevention. Some automotive enthusiasts also advocate putting WD-40 into the gas tank of a vehicle along with the fuel to help clean the tank and eliminate contaminants, such as water, that may be in the fuel. The effectiveness of adding WD-40 to your gasoline will vary, depending on the type of gasoline you're using and the type of fuel system your car has.

Step 1

Purchase a gallon-size jug of WD-40 liquid lubricant. Measure out eight ounces of the liquid in a measuring cup. Many people are familiar only with the aerosol cans, but the gallon bottle of WD-40 is preferred for this use; it's difficult to collect eight ounces of lubricant from the aerosol cans. Pour the WD-40 into a container that has a lid, so you can transport it to a gas station.

Step 2

Drive to the gas station and, after you park near the pump, prepare the WD-40 and funnel. Add gasoline until your vehicle's tank is about half full.

Insert the tip of the funnel into the gas tank. Pour the eight ounces of WD-40 into the top of the funnel, then finish filling your gas tank with fuel.


  • WD-40 can be added to your tank by itself or as part of a mixture of WD-40 and fuel.


  • WD-40 should not be used in the gas tanks of vehicles that have sensitive fuel systems or in those that have fuel injection. WD-40 may not work properly when mixed with ethanol gasoline. Ethanol is formulated to attach to water in the fuel tank, so it eliminates the need for an additive to remove water from the fuel. WD-40 should be used with caution in any vehicle; consult your mechanic before attempting to add it to your tank.

Items you will need

  • One-gallon container of WD-40
  • Measuring cup
  • Gasoline
  • Funnel

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