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You mean just topping it up? It's fine, just check to make sure the existing fluid isn't horribly gross, it should be fairly light colored, if it's dark then you need to flush it and put new fluid in.
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ChanusHarbinger of the Spicy Rooster ApocalypseThe Flames of a Thousand Collapsed StarsRegistered User, Moderatormod
edited November 2009
That $150 is for a full system flush, not just topping it off.
"Mixing" transmission fluid, like grade-wise, can be problematic... but your owner's manual should tell you which type to buy.
Topping it off is normal (and wise). Just make sure it's not dark brown looking.
So I'm wondering how BAD of an idea is it to mix transmission fluid?
Ideally you should flush it but the situation isn't quite as dire as it is with oil or brake fluid. You can top it off without much risk. Transmission fluid is a longer term problem; eventually it will destroy the transmission but eventually means like hundreds of thousands of miles as opposed to engine oil which becomes a dangerous problem somewhere between ten thousand and twenty thousand miles (unless you're bleeding it in which case it becomes more like... ten miles).
Brakes on the other hand are serious business, you do not casually top off a brake reservoir once it's down to the pipe... air is compressible. In brakes, compressible is bad.
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"Mixing" transmission fluid, like grade-wise, can be problematic... but your owner's manual should tell you which type to buy.
Topping it off is normal (and wise). Just make sure it's not dark brown looking.
Prices differ and you can shop around for different prices on flushes.
I would hate for you to have to buy a new transmission do to lack of changing your fluid every such and such miles.
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Are you saying you need it because you've gone 60k miles?
Check your documentation.
Brakes on the other hand are serious business, you do not casually top off a brake reservoir once it's down to the pipe... air is compressible. In brakes, compressible is bad.