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Years ago, the opinions I heard said that when initially switching from dino to synthetic the synthetic oil could slip or weep past the old seals in the engine and turn your car into a leaker. I don't know if this is actually true but seemed to be plausible I changed our 84' Carrera from dino to Mobil 1 20W50 and it indeed did start to show oil where it never had before. I continued with the Mobil 1 because I figured once the seal is breached it will never seal tight again. Or, on the other hand, old seals will leak eventually anyway, so who knows.. I personally believe that the advantages of the synthetic over the dino, considering how expensive these engines are to rebuild, make it good to move to the synthetic. Just sayin'
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