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Message: <blockquote data-quote="EddieS&#039;04" data-source="post: 855519" data-attributes="member: 61136">Bill, didnt know rp was around that long. When I asked him about it. He said they didnt test it. I assumed it wasnt around then.Flatlander, my uncle was talking about modern day engines, of the last 15 or more years. Not engines that have been broke in or high milage. That would include our tracs. I trust his word. He said modern oils have everything in them that todays motors need. He told me they found that some additive conflicted and broke down the additives in some oils. Their builups and teardown specs, prooved it. He did say oil change intervals were dependent on abuse and stop and go. He said best thing is to get your oil sample tested. Then you really know when. He runs the Rotella syn. in his F-250 powerstroke that is not stock.</blockquote>