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Differentials Limit Slip, gear ratio discussions.

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Old 08-15-2006, 02:26 AM   #1
azca
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Default Which differential OIL to use?

Red Line? If so, what model/viscosity?

I have 1995 318ti
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Old 08-15-2006, 02:46 AM   #2
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75W90
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Old 08-15-2006, 02:46 AM   #3
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LS?

Redline 75W90

Our most popular gear oil, 75W90 is the preferred product in nearly all car and light truck differentials, both conventional and limited-slip, as it contains friction modifier which is recommended for limited-slip units. Our 75W90 Gear Oil is common in racing differential applications and can be used in transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization. Exceeds API GL-5.

Used in the Club Sport.
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Old 08-15-2006, 03:11 AM   #4
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how many quarts do I need?

Also, do you guys use a pump? or what do you use to let new oil in?
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Old 08-15-2006, 03:48 AM   #5
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Site's down, but I pretty much followed this guy's instructions:

Ron Stygar

The only difference is I use a suction gun to drain what's just sitting in the bottom.
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Old 08-15-2006, 03:49 AM   #6
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I should also mention that Redline hypoid gear oil smells like rotten eggs. Do not do this on a hot day, and wear rubber/nitrile gloves.
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Old 08-15-2006, 05:27 AM   #7
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All hypoid oil smells like that, its the HIGH sulphur and nickel content that give it the gear box aroma...


Dave
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Old 08-15-2006, 05:31 AM   #8
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buy 2 qts. you need 1.25/1.32 for the small diff IIRC.
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Old 04-12-2020, 07:27 PM   #9
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My 1995 318ti has the limited slip option - "S209A Differential lock 25%" - per the VIN lookup. Also did the rear wheel spin test and both wheels turn in the same direction. Bentley manual states that cars with LS use 75W-140 gear oil, but most forums and tutorials are saying 75W-90 since this LS doesn't have clutch packs. Any advice?
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Old 04-14-2020, 03:35 AM   #10
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I put Amsoil 75w-140 in mine year's ago and it's been fine.
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Old 04-21-2020, 04:01 AM   #11
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Thank you, Bradestar.

Got the bolts off, which was surprisingly easy, but then noticed that both bolts that came out were different that OEM ones ones that I got on Pelican. Attached are a couple of photos of a new bolt compared to one that came out. New one has the o-ring and is shorter. Any thoughts?
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Click image for larger version Name:	bolts.jpg Views:	583 Size:	32.1 KB ID:	17869  
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Old 04-21-2020, 04:47 PM   #12
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Did some more research, and I think the bolts with the o-rings are a newer BMW design that superseded the bolts that use a crush washer. Ron Stygar's tutorial shows the same bolts that came off my car.

Even though realOEM shows the bolts using an o-ring also have a crush washer, I don't think that would make sense. Newer BMWs whose differentials/final drive plugs have an o-ring bolt don't use washers. Also, the torque spec for o-ring bolts is less than ones that use washers (44 vs 52 ft-lb).

Anyway, I'm just going to use the old bolts with new washers. The only reason I got new bolts is because I thought the old ones would have o-rings and needed replacing.

Thanks for listening! Maybe this will help others who come across the same dilemma

Last edited by aldogg7; 04-21-2020 at 07:34 PM.
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