personally I like amsoil iv never had a problem with it (dosent mean that everyone likes it) I wouldent wast the money putting it in my trans tho I use kendal sae 50 works good year round. I dont know why evryone is so bent over amsoil warranty they make their oil for race use and fleet use I dont know of a company that will warranty something used for eather. for example mopar performance parts (any mopar part beginning with P) are not coverd by any warranty of any kind, heck they are not evin returnable if not used & still in the package. As for the consumer line
http://www.performancemotoroil.com/Warranties_and_the_Magnuson.html