Engine oil & Diff Fluid - 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 03-09-2010, 01:39 AM
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Engine oil & Diff Fluid

Hey everyone just bought a 89 325is, and I want to do some service to it, I'm a firm believer in Castrol motor oil, but what viscosity should I use for a motor that has a 130,000 miles on it? It has according to the vin# a 3.73LSD, what type of fluid do you recomend for the rear diff? & Synthetic or Reg. gear oil W/an additive? Any suggestions would be much appreciated.
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#2 (permalink) Old 03-18-2010, 06:01 AM
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just did a search and seems like people here run 10w40 in winter and 20w50 in summer. Might help?

btw your your local parts shop will be able to check this for you easily in their computer when given your license plate
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#3 (permalink) Old 03-18-2010, 10:46 AM
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in my 89 325i with 170k miles I ran 5w30 full synthetic Mobil 1 and in the diff I don't remember the weight but I also did full synthetic Mobile 1 with an additive because without it, my diff would make a rubbing/grinding noise when turning a sharp corner at low speeds. The additive fixed that...I don't remember the name but I did buy it at autozone.

Sorry for the lack of details, it's been a few years. Hope that gives you a little help though.

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#4 (permalink) Old 03-18-2010, 11:17 AM
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5w40 synthetic here, been run that way for the last 10k miles.

R.I.P fast 6


Two wheels or Four, I'm happy as long as the throttle is pinned.
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#5 (permalink) Old 03-18-2010, 11:32 AM
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Fluid Change

Thank you for your suggestions!
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#6 (permalink) Old 03-19-2010, 04:13 PM
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Redline Diff and MTL in the trans check thier website must get correct fluid for LSD diff or screwed

Cheers,
Richard Fitz
'87 325is Delphin Metalic

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#7 (permalink) Old 03-19-2010, 08:39 PM
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Fluid Change

Much Apreciated
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