Wolverine Heaters - Model 9.0 - 125 Watts - Engine Oil, Reservoir, Biofuel and Hydraulic Fluid Heater (120 Volts) 100% Satisfaction Guarantee - Made in USA - 2 Year Warranty Heats 3 - 6 U.S. quarts of oil (2.85 - 5.7 liters) or hydraulic fluid up to 5 gallons (up to 19 liters) Eliminate cold starts. Faster - easier - hotter engine cranking in cold weather. Tested to -30 degrees. Easy peel & stick application. Installs in minutes, no tools required, no hoses to cut. Apply to flat METAL only. Environmentally Friendly - Reduces start up smoke and harmful emissions.