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Old 10-05-2013, 06:50 PM   #1
Macho Toy
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Dealer says VIN won't identify rear end type - What?

Bought the car recently and had one of the guys on another forum run my VIN just to see what I have and was happy to learn that I apparently have a 25% LSD. With this info in hand I go to Maranello to get the OEM diff oil. Parts lady asks for my car's year, make & model and tells me it's not an LSD and insisted that only the M series have these according to her techs. I offered my VIN but she said there's no way to tell what diff I have with the VIN number and that she would not be responsible if I bought the wrong type of oil.

Ok fine, so I buy the recommended oil for an open diff and go home. Still not convinced, I put the car up on jacks and spin the wheels. They both turn in the same direction - WTH

So now totally confused, I turn to you guys for some input and suggestions. I want to put the correct oil in.

Dan
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Old 10-05-2013, 07:12 PM   #2
SickFinga
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What car is that? Post your last 7 characters of the VIN.

By the way, LSD gear oil can be used in open-diffs, but open-diff should not be used on cars with LSD.
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Old 10-05-2013, 07:20 PM   #3
Macho Toy
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Originally Posted by SickFinga View Post
What car is that? Post your last 7 characters of the VIN.

By the way, LSD gear oil can be used in open-diffs, but open-diff should not be used on cars with LSD.

Thanks I did not know that, If I had I would have bought the LSD type.

VIN is - AM70160
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Old 10-05-2013, 07:44 PM   #4
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Quote:
Originally Posted by Macho Toy View Post
Thanks I did not know that, If I had I would have bought the LSD type.

VIN is - AM70160
Definitely has an LSD. It could've been replaced with an open one, but not likely.

To make sure, look at the diff



There should be a tag



If it starts with an S, it's a limited slip.
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Old 10-05-2013, 07:53 PM   #5
Macho Toy
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So can a VIN determine the original diff in a car? If so, can someone at a dealership tell me otherwise?

Wow! that diff looks immaculate. Aha, so that's what the tag looks like, I did see that on mine but didn't know it was a tag since it's all rusted beyond recognition. I'll try a wire brush and closer inspection.

Thanks again for the info

Dan
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Old 10-05-2013, 08:05 PM   #6
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So can a VIN determine the original diff in a car? If so, can someone at a dealership tell me otherwise?
Yes. Whoever dealt with your, doesn't know what he/she was talking about. Here is your build sheet straight from the BMW servers.



By the way, do not waste your money buying fluids at a dealer. Go to either Canadian Tire, Napa or Parts Source and get a synthetic 75W140 gear oil that is approved for LSD.
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Old 10-05-2013, 08:27 PM   #7
Macho Toy
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Cool SickFinga, I can't tell you the number of times I get "dismissed" by "licensed" mechanics and parts people when I mention the forums as my source of information. I will take this sheet with me back to the dealership and hopefully get this sorted out.

Thanks again,

Dan
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Old 10-05-2013, 09:49 PM   #8
TSI
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If I can make a recommendation, use redline 75w90 API GL-5 oil. It's not too expensive, and it cured a bit of my diff lash.
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Old 10-06-2013, 01:31 PM   #9
jabela
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I recommend JRP Auto as a cheap source for Redline fluids.
http://www.jrponline.com/webstore/in...link=contactus
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Old 10-06-2013, 02:16 PM   #10
Macho Toy
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Thanks for the recommendation guys.

What's the difference between the 75W140 vs 75W90??? Do these have the friction modifier required for the LSD? Sorry for sounding like a noob but this is why I went to the dealership in the first place, thinking they would know best - go figure.

Dan
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Old 10-06-2013, 03:48 PM   #11
TSI
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Quote:
Originally Posted by Macho Toy View Post
Thanks for the recommendation guys.

What's the difference between the 75W140 vs 75W90??? Do these have the friction modifier required for the LSD? Sorry for sounding like a noob but this is why I went to the dealership in the first place, thinking they would know best - go figure.

Dan
Second what jabela said--JRP is great.
Any gl-5 oil has the modifier in it already, so it's lsd-ready!
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