>
> >Someone once advised me NOT to change the Transmission fluid because
> >it can do more harm than good. I have pretty much disregarded his
> >advice but does anyone have any reasons why he would tell me that,
> >other than he wanted to sell me a transmission?
> >
> >Dave
>
> I have heard this as well, but only in cases where the fluid has been
> neglected for long periods. The two possible reasons I can think of are:
>
> 1. The neglected fluid has lots of crap in it, which deposits itself all
> over the tranny. Fresh fluid might break this stuff free, clogging the
> complex hydraulic passages and/or ball valves, thus rendering the tranny
> useless.
>
> 2. The neglected fluid changes chemically with age, "loosing" the additives
> for friction reduction & oil seal health. The seals swell over time because
> of this, and there is extra wear on them at the seal/shaft interface.
> Changing to fresh fluid could cause them to shrink back to normal size,
> causing all kinds of leaks because they no longer seal against the shaft.
> The same would go for o-rings.
>
> These are just educated guesses; maybe this is just more BS from tranny
> shops to get you to neglect your transmission.
>
> -Karl
>
>
My vote would be that their just trying to get you to mess up your tranny
so you will have to buy a new one from them because I see no way how
leaving old fluid in your tranny indefinitely could be good for it,
because eventually all the anti-friction properties will be gone and will
be like driving with water (because like water it will offer no
protection against friction) in your tranny which is nothing but bad for
it. Just my opinion....
Bruce
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