differential and manual tranny oil - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 04-25-2009, 05:21 PM
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differential and manual tranny oil

The manual says gl4 for the manual gearbox and 90 for hypoid gears. Is the gl5 a substitute for the gl4? Can it be used in a 1986 320i? Can a regular gear 85W90 gear oil be used in the differential or does it has to specifically be made for Hypoid gears, which by the way what is hypoid gear?

Thanks for your advice.
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#2 (permalink) Old 04-26-2009, 07:49 PM
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Everywhere that I have read you can use regular gear oil for the differential, which I have been thinking about doing here soon to my 86 325es. I am not sure for the gearbox.

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#3 (permalink) Old 04-29-2009, 07:33 PM
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Originally Posted by M3Dreamer View Post
Everywhere that I have read you can use regular gear oil for the differential, which I have been thinking about doing here soon to my 86 325es. I am not sure for the gearbox.
90W GL-5 gear oil seems to be the ticket for the differential (1990 3-series owner's manual).

Wipe the grime from the transmission, and you should see a sticker saying what goes in. The sticker happened to be bottom-front near where the transmission bolts to the engine. In my 91 318i manual five-speed, it happens to be automatic transmission fluid. My experience aside, you have to confirm it for yourself.

Adios for now.

Last edited by romeomike; 04-29-2009 at 07:34 PM. Reason: small grammatical clean-up
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