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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E23 / E32 (1977 - 1994)

7 Series - E23 / E32 (1977 - 1994)

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  #1  
Old 11-08-2009, 07:52 PM
CodyItaliano's Avatar
CodyItaliano CodyItaliano is offline
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Mein Auto: 2001 740i
Question Proper differential fluid type?

i'd feel better changing my '02 E38s diff fluid. says its lifetime, but we all know its not. i have a feeling they would have originally used a synthetic fluid, most likely a multi weight like 75W90. i plan on doing this fairly soon, i would likely use Castrol Syntec gear oil, as i already trust their motor oil.

so anyone have advice on this, what weight to use. its got 111000 miles, makes no noise from the diff so its in good shape. lmk what your thoughts are one a fluid change.
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*Der E38*
manufactured: 7/01
color: anthrecite metallic
wheels: style 89 E66, 19X9F 19X10R
ext. lighting: 8000k D2S & LED plate light
*want to get sport rear diff*
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  #2  
Old 11-12-2009, 07:15 AM
balance balance is offline
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I just went to the dealer and paid for it right after I got all that "lifetime" bs. If I remember right it only takes about 1.1 quarts so all it cost me was about 35 dollars.
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Old 05-27-2010, 09:35 AM
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PETER NEWMAN PETER NEWMAN is offline
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diff oil

Hi Cody, I live in the UK and I can buy the correct Castrol diff oil from a company called OPIE OILS in the UK and like my posting about auto tranny oil changes which you replied to I feel that long life oils should be changed, Peter.
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Old 05-27-2010, 07:50 PM
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CodyItaliano CodyItaliano is offline
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i can probably buy the exact fluid from either one of my suppliers or the dealership. but i was going to go with castrol syntec diff fluid. probably 75W90 weight.
__________________

*Der E38*
manufactured: 7/01
color: anthrecite metallic
wheels: style 89 E66, 19X9F 19X10R
ext. lighting: 8000k D2S & LED plate light
*want to get sport rear diff*
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  #5  
Old 05-28-2010, 04:47 PM
balance balance is offline
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I've heard of people using that before Cody, and it probably is compatible, but I got some of the factory fluid left over and this stuff is as thin as tranny fluid.
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  #6  
Old 05-28-2010, 10:34 PM
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CodyItaliano CodyItaliano is offline
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i'll check that out then, if its really low viscosity fliud, it needs to be kept that way.
__________________

*Der E38*
manufactured: 7/01
color: anthrecite metallic
wheels: style 89 E66, 19X9F 19X10R
ext. lighting: 8000k D2S & LED plate light
*want to get sport rear diff*
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