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Registered
Join Date: May 2005
Location: Houston
Posts: 5,469
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Recommendations on Gear Oil for an Old Factory LSD (BMW)
Guys - what would you recommend for LSD Gear Oil for a factory LSD (clutch pack), the car is my 1979 BMW 635CSi?
I'm thinking something beyond just straight 75W90? Thoughts? And here is the recipient: 
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Ole Skool - wouldn't have it any other way |
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11-07-2020, 04:48 AM
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Registered
Join Date: Sep 2009
Location: North of You
Posts: 9,160
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I think there's limited slip oil, and non-limited slip oil. Beyond that, I've never worried beyond that.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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11-07-2020, 05:11 AM
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Too big to fail
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I'm using Castrol LS80W/90 in my XKE
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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11-07-2020, 06:12 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Call Redline oil- technical help. They'll recommend what best suits your application based on what was spec'd from BMW
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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11-07-2020, 07:54 AM
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Retired, finally
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https://www.redlineoil.com/find-products-for-my-vehicle
https://www.redlineoil.com/75w90-gl-5-gear-oil
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2009 Porsche Cayenne Turbo S; 2019 Corvette Grand Sport Coupe; 1998 Porsche Boxster; 1989 Toyota Supra ChumpCar; 1989 Alfa Romeo Spider; 1977 Porsche 911S Targa 3.2L"Bwunhilde II" chimera; 1970 Datsun 240Z 2.9L "dogZilla" project |
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11-07-2020, 07:57 AM
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Team California
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How about Gl-5, (ltd. slip), gear oil in the viscosity called for in the owners manual?
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Denis The only thing remotely likable about Charlie Kirk was that he was a 1A guy. Think about that one. |
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11-07-2020, 08:07 AM
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Team California
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Quote:
KISS. 
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Denis The only thing remotely likable about Charlie Kirk was that he was a 1A guy. Think about that one. |
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11-07-2020, 08:08 AM
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Join Date: Nov 2000
Location: AZ
Posts: 8,414
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Assuming it's a clutch-pack LSD, KISS = Redline 75W90 gear oil (the non "NS" version).
If you want to put a little more thought into it, you might bump it up to the 110 weight (or even 140), depending on intended use/temps/speeds/HP/etc. The higher weights will have a higher film strength strength and (shear) stability when at operating temp, and will typically be less noisy as well. The trade-off is more drag/less flow (potential sludge, hot spots, etc.). You can also go with the "NS" version of whichever weight you choose, and then add friction-modifier as needed to fine-tune the LSD. YMMV... |
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11-07-2020, 09:56 AM
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Registered
Join Date: May 2005
Location: Houston
Posts: 5,469
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Thanks for the suggestions guys
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Ole Skool - wouldn't have it any other way |
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11-08-2020, 03:49 AM
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Bwunhilde II
Alfadite
