I'm looking for the experience of folks who have had Amsoil in their manual transmission for an extended period. (preferably northern tier states or Canada). I just had my transmission replaced at 69K miles under warranty. It had the 6th gear howl as well as the moving shift lever in low gears. I had changed the oil for Amsoil at 45K, but I think the damage was already done, as only about 1.3 quarts came out. The Amsoil was also rather noisy during the winter cold. I have fresh Amsoil waiting to go in; I would just like to reassure myself that is the best option.