Originally Posted by Kaiser
Are any of you guys running different weight oils other than 5w-20 with or without MDS active without any problems?
Been using M1 5-30 since changing out the factory fill at 6K miles.
Now at 19K miles (1 year). No check engine lights. No noticeable difference in how MDS operates, no noticeable difference in cold engine noise (don't think my truck is particularly noisy anyways).
I suspect my hot viscosity is close enough to 5-20 hot viscosity that there's not an issue.
Not making any recomendations... just answering the question!