Originally Posted by PimTac
Wasn't that around the time that news came out that 10w40 was not a good oil to run? There was a general switch back to 30 grade.
Right. GM had a terrible time with 10w-40 and sludge in their engines, cam wear problems, spun bearings and warranty claims and condemned 10w-40.
Wasn't that around the time that news came out that 10w40 was not a good oil to run? There was a general switch back to 30 grade.
Right. GM had a terrible time with 10w-40 and sludge in their engines, cam wear problems, spun bearings and warranty claims and condemned 10w-40.