Quote:
Originally Posted by TEX
I use synthetics in my vehicles from the start and change every 10K. BUT you should not switch to synthetic oil if u have regularly changed your oil in an older vehicle with 75k + miles. Your seals and gaskets can start leaking.
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I think it was originally thought that Synthetics had detergents in them, and overtime, would remove buildup around seals that weren't leaking soley because they were blocked up by said buildup.
I have no idea if that is, or ever was true.