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      11-13-2011, 12:51 PM   #1
yusammyyu
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lsd (differential) oil change time?

I check my 1200mile service report and dealer didn't change lsd oil for me that time. After I check the forum, seems like a lot people get lsd oil change when 1200 miles service, right now my car has 17000 miles already,I asked dealer when should I change lsd oil, they told me every 30000 miles change one time . the car runs good and no any noise from lsd, and I am planning go track next weekend, so question is, Do I need change lsd oil before track?
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      11-13-2011, 01:00 PM   #2
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Quote:
Originally Posted by yusammyyu View Post
I check my 1200mile service report and dealer didn't change lsd oil for me that time. After I check the forum, seems like a lot people get lsd oil change when 1200 miles service, right now my car has 17000 miles already,I asked dealer when should I change lsd oil, they told me every 30000 miles change one time . the car runs good and no any noise from lsd, and I am planning go track next weekend, so question is, Do I need change lsd oil before track?
They were suppose to change it. The BMW service bulletin for the 1200 miles services says so. You are getting jipped.
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      11-13-2011, 01:21 PM   #3
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You should change the LSD sooner than what BMW recommended. Here's my oil analysis after 5k miles with some track hours: http://www.m3post.com/forums/showthread.php?t=558351
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      11-13-2011, 01:30 PM   #4
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At the same time what if they put in the wrong oil like has happened so many times! Might go with the "it aint broke don't fix it" unless you are a tracky junkie
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      11-13-2011, 01:40 PM   #5
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Quote:
Originally Posted by wwjd15 View Post
You should change the LSD sooner than what BMW recommended. Here's my oil analysis after 5k miles with some track hours: http://www.m3post.com/forums/showthread.php?t=558351
notice "Wear looks fine in this initial sample out of your BMW's differential. Universal averages show
typical wear levels for this type of differential after about 30,000 miles on the oil." in your report, what does that mean?
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      11-13-2011, 01:41 PM   #6
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Originally Posted by Ateam View Post
At the same time what if they put in the wrong oil like has happened so many times! Might go with the "it aint broke don't fix it" unless you are a tracky junkie
which oil they suppose to use??
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      11-13-2011, 02:35 PM   #7
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They didn't change mine either. All I got was an oil change. Did you get the filter(s) changed? I thought the LSD oil was only for cars making noise during turns, and you have to request for it since it does no harm to the car? I heard they don't change it anymore. I also heard oil for the LSD will make it quieter, but will make the LSD less effective? What did they do exactly to your car at the 1,200 mile service?
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      11-13-2011, 03:22 PM   #8
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I just had my LSD fluid changed again AFTER the 1200 mile service. Was experiencing a thunk/clunk/rub in the rear when turning the vehicle after the break-in service.

Dealer told me that when delivered from the factory, the LS had a synthetic fluid in it. BMW specs called for a "lesser quality" non-synthetic fluid at the 1200 service and this they said caused my problem.

Anyways, 40 minutes later I had the synthetic fluid back and (knock wood) the symptoms are gone..

Just a "heads-up" to you thinking of a lsd fluid change...
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      11-13-2011, 04:40 PM   #9
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I am confused now,dealer change wrong LSD oil for us at 1200 miles service? Then why do we need change it? Should I change it or not now?
Ps: I never go track before , only ran uphill for 9 minutes month ago,and all the 17000miles was almost on freeway
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      11-13-2011, 05:15 PM   #10
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The differential fluid should get changed at the initial 1200 mile service.

<rant>This is why I can't stand this "free maintenance" bullshit. It's not free. It's included as the cost of the car. Yet somehow the service items/intervals aren't specified anywhere. (I remember seeing a partial list in a 2008 owner's manual, but I can't find anything in my 2011 owner's manual) To make things worse, BMW NA won't give you the list, and different dealerships will tell you different answers. At the end of the day, I have no idea what the hell I paid for.</rant>
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      11-14-2011, 02:41 PM   #11
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Both BMW differential oils are synthetic, but the one with a special modifier in case differential makes excessive noise is a lot more expensive. But if it doesn't make any noise even at full lock, it means it's less effective due to extra slippage. If the differential makes a bit of noise at full lock, it's perfectly okay (outer wheel is rotating faster than inner one, meaning LSD is doing its job).

As far as changing the oil, with only 1.3L (1.2L with a 'quick' drain), it's cheap insurance to do it more often than recommended (just like engine oil, tranny, etc), especially at the beginning, when wear is at its maximum (and no magnetic plug ). I do it every 2 years, which amounts to about 8K miles for me And same with the tranny, which only holds 2L after an overnight drain (1.8L otherwise). I used RP in both cases, but am sticking with TWS due to warranty concerns if bearings fail, but 5/40 is what I'd use on this car (no tracking here) otherwise, just like Porsche, Ferrari, Lamborghini, etc.

Last edited by elp_jc; 11-14-2011 at 02:51 PM.
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