50-60 k is about maximum mileage a person would usually switch from 'dino'
to synthetic and still expect to extend seal and engine(metal parts) life.
<shanec@spie.org> wrote in message
news:E5DA1AF314C7D2119D5E0008C75D85A903BB9C77@XENA...
> Would switching to synthetic oil on an engine that has 115,000 miles on it
> do any good? I've been using Pennzoil 10w30 for the past 6 years I've
owned
> my 92 CC 3.9l 4x4 auto and haven't had a single problem. However, I would
> like to get that last little horsepower out of the engine. Would the left
> over oil and oil deposits in the engine cause any problems with synthetic?
> Thanks in advance!
>
> Shane C.
>
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