T5O-D Fluid change, use Mercon Auto Fluid? or 80W gear oil?

HISSIN50 said:

another dealership gem from Nick. my owners manual says the trans fluid does not have a service interval and is good indefinately. 10K is a tiny! service interval for any trans, let alone a stick which does not stress its fluid at all!
not doubting you at all Nick - you are privy to info that many of us (me included) are not.

real-world speaking, i would have no qualms about letting the fluid go for a bit longer than that, and synthetic indefinately if not beaten upon.

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Stang8URMPRT said:

Yep. I totally agree with you. It's another way of making money, that's all. But at every 30K we flush them, never at 10K anyway on the V6 Stangs that have T-5s. Tranny fluid is dirt cheap, and it's cheap insurance. I do mine ever 5K or so, but I don't drive it much. When I got my new car (my dads old) he never changed the trans fluid in it.. so when I did the clutch 2 weeks ago, I drained the fluid and it was B-L-A-C-K!!!! I was like OMG WTF!!! 99K on it, and original trans fluid. Flushed the hell out of it and refilled it. I almost smacked him the next time I saw him lol.

Nick

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HISSIN50 said:

yeah, i see your perspective Nick (i change even synthetic every few years, but not nearly as often as you. you probably drive more spirited than I. ).

hey i got one for you - when i got my stang (dealership serviced its whole life!), it appeared to have the original ATF in the T5 (owner said it was never changed; i have all the receipts and there is none for a fluid change).
anyhow, when i drained it, it had the viscosity of ATF, but the thing was, it smelled a bit like gear oil (i know it did not have gear oil in it - only the smell).
I have read several other similar accounts (from people whom i think are pretty savvy) - what are your thoughts? have you come across this or am i just weird?

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Stang8URMPRT said:

We've got cool guns at work that depenses all different kinds of oil, many guns... I just drain all the fluid, put the drain plug back in... fill it back up with the gun, drain it, and then run another 3-4 quarts through it to get it all out, then fill 'er up.

Nick

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