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Originally Posted By: benjamming Big Jim meant Dexron VI not Mercon VI. OK, I'll go with the Dexron VI then!

Originally Posted By: cheetahdriver seeing as mobil published the Aunt Millie test with 60 months in actual operation on 1998 synthetic oil, the "12 months open" opinion is laughable. i just mailed off my father's oil sample out of his tundra. 5 years and 10k. i look forward to another boring...

Originally Posted By: Big Jim It will not matter. By the way, GM no longer licenses Dexron III and Ford no longer licenses Mercon. You can find current fluids that are "for use where Dexron III/Mercon are specified" and they are probably close enough. Ford now says that Mercon V is specified...

Originally Posted By: Barkleymut I will only give you my expert advice if you bring that beast down to VA and let me drive it for 50 or so miles. In trade you can drive my '07 300HP GT. Sound fair? see ya tomorrow! I've owned mine a long time... I drove a car like yours recently, when you step...

I run OK on premium, but I can't advance the timing without it knocking. I think that it was a nice rebuid, I remember that the engine was so tight when I first got it back that it would hardly turn over & needed lots of gas to get going. I'm sure that's why it calls for 10w-30. If I go with...

Thanks, I had written to Royal Purple & they responded with a similar recommendation. Just to be safe, I'm going to get the ATF analyzed to see if there has been any damage. If not, I would like to continue with Dexron & move to a synthetic if that is possible. By the way, The transmission is...

I’m resurrecting this thread & wanted to ask about why you think that a rebuilt trans is immune from ATF recommendations? I have a Ford C6 which was rebuilt and filled with Dexron by the builder. I’ve never been comfortable with that, but the tranny shifts and operates great. I'd like to replace...

Thanks, everyone for your responses. I'll need to look into a pre-luber if I can keep it discreet. Otherwise the Delvac sounds like a possibility - I'm just looking for something that will cling for a long time & pump up quickly. I'm not sure if it will harm anything if I use a 5W weight. The...

I stumbled on this site recently & spent many hours surfing around. I have a different application than what I have been reading here & would really appreciate some of your opinions… I have a 1969 Mustang with a high compression 428CJ that was rebuilt about 15,000 miles ago (about 8 years ago)...