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Another question PLEASE??? Stopped in today to buy the Shell Rotella T oil. Found out there are several "T"'s?? T1, T4, T5, T6 and maybe even more. I read everything on the jugs but it said nothing regarding ZINC, just what standards it meets, which really means nothing to me. I thought you all...

Thanks all. One last question? Does it not matter that the Rotella T is (I would suppose) a detergent oil?? Thanks

Thanks guys, I will look this all over well. We were not aware of this years back when we started running these vehicles. But a gentleman at a local parade mentioned it to me and I thought I better check in on this. Thanks

Going to have to do something about this oil leaking, but what ever we do I need to get the correct oil for this M135 six cylinder GMC gas engine. I was told at a parade that modern oils do not have the additives needed because of something to do with the bearings for the cam? He said that if...