Originally Posted By: benjy
the 5-40 which is prolly group III a LOT of viscosity improvers are needed, hence its shearing. unless you start + ride in very cold weather a 5W is a waste IMO
I agree completely. Unless you are a hard core cold weather rider, 5w-40 is not needed. Rotella T4 15w-40 will be a much better option and won't shear down near as fast as any 5w-40. I have also used Delo, Delvac and SuperTec 15w-40 with success but I like the new Rotella T4 15w-40 the best now.