Kat's KAT15200 Engine Oil Dipstick Heater, 24"Cold temperatures place extraordinary demands on vehicle lubrication, engine and transmission fluids thicken and do not circulate well at cold temperatures. Dipstick style oil heaters transmit heat continuously to keep oils fluid, giving you instant lubrication when starting your engine, plus improves oil flow to provide better lubrication, which reduces wear and increases engine and transmission life. 23" element Works on dipsticks up to 24"