Quote:
Originally Posted by GGG
Why does this happen? It just doesnt make sense.
Some of the logic I have read is that it is thinner therefore leaks in old seals. This is obviosly false as this is contolled by the viscosity of the oil which is a property you buy not one inherant to dino or synth. In terms of seats and seals being damaged by synth this doesnt make sense either as the oils meet the same API specs.
So is there a reason? Or is this a car myth like not switching back and forth between oil types because your car is used to one type of oil.
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In a lot of engines run on dyno oil the only think keeping some of the mating surfaces from leaking is deposits. The molecules of conventional oil come from organic materials and are not uniform in size and there are larger and smaller ones while lab made synthetic oil molecules are of smaller, uniform in size. Larger molecules of conventional oil may block minute leak paths that synthetic oil will clean away and pass through.