I used this TFE paste to change the oil in a Harley-Davidson transmission, primary crankcase and engine. Works fine like a week so far no leaks. Application Tip: Make a small hole in the hole of the tube so that when you press lightly, only a small thin line for small oil plugs comes out of the tube. TFE paste provides additional drop protection in case the o-ring does not sit well on the body. This tube will last me for years.