Ok before I get flamed.. This is a question I can not seam to anwser. Why did the durmax suplement manual list 10w30 as an approved grade from 2001-2006 but not from 2007 on?
I would have thought that it would be listed especialy since ford and cummains has 10w30 approved. Per gm they changed the main and rod bearings for an improved oil film... or something similer to that. So if I am correct, could one assume that 10w30 could be used even if not an approved grade?
I would have thought that it would be listed especialy since ford and cummains has 10w30 approved. Per gm they changed the main and rod bearings for an improved oil film... or something similer to that. So if I am correct, could one assume that 10w30 could be used even if not an approved grade?