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synthetic oil question



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Old 11-12-2010, 10:00 AM   #1
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synthetic oil question

I have heard my whole life that once you put synthetic oil in a motor you can't switch back to dino oil. Does anybody know why? You can buy a synthetic bleded oil wouldn't this be the close to the same if you switched back and forth?

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Old 11-12-2010, 10:10 AM   #2
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call mobil1, they will answer your question. That may be a myth started when synthetics first were marketed IMHO.
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Old 11-12-2010, 11:09 AM   #3
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Amsoil says right on the bottle that it's compatible with mineral oil. Why would you want to switch back anyway?
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Old 11-12-2010, 12:56 PM   #4
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Agreed, IMO all a myth. I've done it and seen others as well. The only thing I've seen is a leak from cover seals, but IIRC it had something to do with seal swelling/shrinking differences in the two, detergents, molecule size, etc. But that was years ago when they first became big. As advanced as oils are now I doubt it’s still an issue.
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Old 11-12-2010, 04:46 PM   #5
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The molecules are smaller as well as all uniform size. The synthetic doesn't create the leak problem. It just tends to leak before the mineral oils would. Either way, you would have had a leak.


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