There is nothing that I want more than a longer life for my engines.  I happen to work on all kinds of different boats, cars, trucks, motorcycles, you name it.  There isn’t a single one that I don’t use some kind of amsoil for.  The stuff is just that good and I could not imagine using anything else.  I am currently working on a truck that uses amsoil 75w90 long life synthetic gear lube.  I must say that I am so impressed with the way that it is performing that I am telling all of my truck buddies that they need to change.