Originally Posted By: 72sub
Thanks for the info. Is using an xW40 a warranty concern?
Maybe, maybe not. Do note that you can run a high HTHS 5w-30 according to the manual, as long as it's SN. If you read the paragraph in the manual before that chart, it says that an SN 5w-30 is acceptable, and doesn't have to be actually SN/GF-5. Castrol agrees with me on this. If you decide that an ordinary 5w-30 isn't "good enough," for whatever reason, you can run Delvac 1 LE 5w-30 or a competitor's equivalent in E6, E7, E9, SN, with its elevated HTHS. It will have an HTHS quite similar to a lot of 40 grades and will still meet the manual concerns, if that is an issue for you.