I once wrote to Mobil about using synthetic in older vehicles. They said
that if you have leaks, the synthetic will leak more. They said that it
will leak through cork gaskets. They said it would be good to use as long
as your seals are good and not leaking.


"Sparky" <nemo@moon.sun.edu> wrote in message
news:R0U0d.27398$bE1.14575669@news4.srv.hcvlny.cv. net...
> YoYeahBut wrote:
>
> > My mehanic claims that synthetics are very high detergent and are bad
> > to start using on old engines. My 87 Accord has 188,000 miles. He
> > said if it had had synthetic in it regularly before 100,000 miles it
> > would be fine. He reccommends using some of that seal swelling high
> > mileage stuff, but I'm hesitant to use anything that would soften the
> > old seals. Also he says the Honda oil filters are probably a waste of
> > money. He says he's not sure, but he knows the US aotomakers charge
> > too much for their filters. Don't filters need to have ratings like
> > engine oils.
>
> How old is your mechanic?! I haven't heard this argument since the 50's
> or 60's when detergent oils were new. Same deal concerning multi-grade
> vs. straight oils, e.g., SAE 30. There are always 100's of "reasons" not
> to use new things.
>
> PS: What difference is the 100,000 mile mark supposed to mean?