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  #1  
Old 07-09-2010, 01:46 PM
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gear oil for x5

hi, guys
i have 02 x5 4.4 with sport pkg., and i am going to change gear oil. do all x5 have limited differential?
thanks,
james,
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  #2  
Old 07-09-2010, 10:24 PM
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All I used is Redline 75W-90 gear oil. Worked for me. 2 quarts did the job.
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  #3  
Old 07-11-2010, 01:15 AM
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Quote:
Originally Posted by golf925 View Post
hi, guys
i have 02 x5 4.4 with sport pkg., and i am going to change gear oil. do all x5 have limited differential?
thanks,
james,
No X5 models have limited slip differentials, they are regular open differentials. No reason for special gear lube.
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Old 07-11-2010, 09:54 AM
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I can say the BMW OE fluid is an expensive synthetic fluid, but if you plan on servicing the fluid at a normal basis as with other vehicles you should be fine with normal gear lube. The Redline 75W90 mentioned above by CharlieHustle is a synthetic lube as well and a fraction the price of BMW's lube... Should be perfectly fine.
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Old 07-11-2010, 10:23 AM
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I read somewhere that a member used something without an additive and cooked his diff. Is the BMW fluid castrol?
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  #6  
Old 07-11-2010, 05:50 PM
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I read somewhere that a member used something without an additive and cooked his diff. Is the BMW fluid castrol?
I haven't seen that post. I have seen a post whereby a member put ATF in his x-drive transfer case (post 2004) with bad results. I have also seen a post whereby a member put non-gear oil in his differential with bad results.
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  #7  
Old 07-11-2010, 08:18 PM
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I have been using RP 75w90 for about 50k.
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  #8  
Old 07-11-2010, 09:41 PM
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I'm curious too, what is the BMW fluid?
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Old 07-11-2010, 09:45 PM
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If I'm not mistaken it is a synthetic gear oil made by castrol. Maybe I can write down some specs/part numbers etc off the label at work tomorrow. (only if my short term memory works )
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  #10  
Old 07-12-2010, 03:19 AM
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Castrol SAF-XO 75W-90 makes reference to being designed for BMW and to BMW approvals for all non-limited slip BMW differentials in their literature. Seems likely that that is it.
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