Hey everyone, I'm planning on changing the transmission oil in my '90 E34 M20. I have read a lot of conflicting opinions, it seems no one agrees on what to put in the gearbox.. So what are your opinions/experiences? ATF, diff oil, motor oil?
Since I have an automatic, I haven't looked it up, but I would use the owner's manual as my primary resource and the Bently manual as the secondary resource.
If you crawl under the car, there is (should be) a tag specifying fluid. (Mine does).
We have the same model year.
I don't know if they put a different trans in the 525 than the 535.
Wiki would tell the tale, as well.
Ignore the transmission model. Dex3 is supposed to be dangerous to my tranny according to bentley but i have been using it for 3 years with no problems. Use any type of semi or fully synthetic transmission oil. Only the big boys have it and you cant go wrong. If unsure just use zf lifeguard. However this is very pricey, but you can basically double your oil change interval over dino oil.
Or just follow haolibird's suggestions. Royal Purple seems to be the aftermarket brand with the best track record.
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