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BMW 650 GranCoupe X-Drive Rear diff oil #5454512 06/15/20 02:46 PM
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jackliu Offline OP
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I want to drain and replace my rear differential fluid on my BMW 650 XDrive, from my research BMW uses Hypoid Axle Oil G1 (BOT448) P/N: 83 22 2 295 532 which is a 75W85 GL-4 oil, I want to try out the Redline 75W85 oil, however, it is a GL-5 oil, even tho on the redline website it says it is compatible with the BMW 75W85 GL-4 oil even included the BMW part number, from more research online, some say that one should not be using GL-5 oil in GL-4 car because it has sulfur which could cause wear, experts please do chime in. As well is Redline oil a superior product compared to BMW gear oil? or are there other suggestions and why?

Re: BMW 650 GranCoupe X-Drive Rear diff oil [Re: jackliu] #5454553 06/15/20 04:03 PM
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oldhp Offline
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I would have no problem using RedLine 75W85 in my BMW. Dodge HellCats use 75W85 gear oil. If it's good enough for a 707HP car, I would say it's good enough for the BMW. GL5 is made for hypoid differential's.


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Re: BMW 650 GranCoupe X-Drive Rear diff oil [Re: jackliu] #5454563 06/15/20 04:19 PM
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MCompact Offline
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BMW used to spec GL4 oils for their manual transmissions because GL5 oils attacked the bronze synchros. I'd just buy the BMW oil. FWIW, I never touched the diffs on my E83, and it ran fine past 198k miles. The guy I sold it to has had no issues the three years he's owned it.


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Re: BMW 650 GranCoupe X-Drive Rear diff oil [Re: jackliu] #5454579 06/15/20 04:50 PM
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Audios Offline
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I would stick with whats recommended, is it the active diff with the clutch plates?


2002 VW Golf TDI-T5 10/30
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2005 BMW M3 BMW-Twin Power 10/60
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Re: BMW 650 GranCoupe X-Drive Rear diff oil [Re: Audios] #5454729 06/15/20 08:00 PM
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jackliu Offline OP
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Originally Posted by Audios
I would stick with whats recommended, is it the active diff with the clutch plates?

I have no idea lol

Last edited by jackliu; 06/15/20 08:01 PM.
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