How To Change Your Diff Oil

This section shows how to carry out modifications to your 1 Series. Please remember that if you are modifying your car to take photo's at each step and document the mod in here.
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floydroid
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Re: How To Change Your Diff Oil

Post by floydroid » Tue Feb 09, 2016 7:41 pm

Hi, first post here! Just got a 123D and want to change the fluids and not sure if the diff is standard - how do I tell?

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Re: How To Change Your Diff Oil

Post by marco_polo » Tue Feb 09, 2016 7:50 pm

All 123d diffs are standard, no Drexler LSD option from BMW.
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Re: How To Change Your Diff Oil

Post by floydroid » Wed Feb 10, 2016 7:15 am

OK, I understood that was the case, but if a previous owner had fitted one and it wasn't declared, how would someone new tell?

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Re: How To Change Your Diff Oil

Post by marco_polo » Wed Feb 10, 2016 8:42 am

Visually you can't tell easily, I doubt many people would drop £2k on a diff and then not try to use it as a selling point though. It's a huge plus for any BMW.

If they had fitted a Quaife (the most likely LSD in Britain) it might not be relevant, to the oil anyway? There aren't any clutches inside a Quaife which need an oil with the friction modifiers in, they work via interlocking helical gears instead.
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Re: How To Change Your Diff Oil

Post by floydroid » Thu Feb 11, 2016 7:30 pm

Ah, OK!

Yes, it would be unusual to not declare it but after 3 previous owners it may get overlooked.

Thanks

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Re: How To Change Your Diff Oil

Post by lewiswilkinson » Wed Feb 17, 2016 3:20 pm

Sorry to bump..

Is it worth fitting a magnetic diff plug on my '55 118d?

On 112k miles, no record of an diff oil change either. Currently all is totally fine and no noises or anything, but changing the oil in it this weekend to preserve. Got the oil and the drainer / refiller, just wondering if its worth it?

Have heard my 1er (being a 55 plate 118) is prime for having a weak diff? It has a stage 1 map on it too so is doing about 35/40(ish) BHP more over standard, plus torque etc.

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Re: How To Change Your Diff Oil

Post by marco_polo » Wed Feb 17, 2016 3:24 pm

Mag plug's never hurt.

Yes, yours is the diff they made out of brie, can't even handle standard torque so take good care of it.
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Re: How To Change Your Diff Oil

Post by lewiswilkinson » Wed Feb 17, 2016 3:37 pm

Maybe its worth it then for the £15 odd quid

To be honest, currently the diff is currently totally silent, no knocks or anything and is as it should. Bit worried as I do give it some abuse every now and then but not all the time. Just have to keep up with the maintenance I suppose...

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Re: How To Change Your Diff Oil

Post by HaiderGill » Sun Feb 28, 2016 11:26 pm

Used the same stuff on the E90 320d and the non LSD Syntrax stuff on E87 120d did it about 75K miles on the clock. Needed over 2 litres each time. Tied it in with a coolant and ATF/sleeve & sump change. The diff oil think it's a lifetime fill which equates to about 100K miles. So best before then...
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Re: How To Change Your Diff Oil

Post by Cupster » Thu Apr 21, 2016 10:51 am

Nice write up Marco. Ordered my oil and magno-plug ready for a nice bit of TLC soon! Cheers
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Re: How To Change Your Diff Oil

Post by mctga » Sun Aug 21, 2016 4:00 pm

Planning on doing an oil change on my manual transmission and diff when I do a 12 month engine oil change next month on my M135i. Does anybody know the torque specs for the diff plug? The housing is alu and I don't want to go stripping the threads. I've seen some torque values of 60Nm quoted on Bimmerfest but that was for an E90 diff.
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Re: How To Change Your Diff Oil

Post by marco_polo » Sun Aug 21, 2016 4:52 pm

marco_polo wrote:Refit your plug and torque to 60Nm / 44 lbft, done!
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Re: How To Change Your Diff Oil

Post by mctga » Sun Aug 21, 2016 5:10 pm

Ok, cheers Marco
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Re: How To Change Your Diff Oil

Post by Rustynut » Sat Nov 19, 2016 7:15 am

Do all M135i have the lsd as std.

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Re: How To Change Your Diff Oil

Post by marco_polo » Sat Nov 19, 2016 8:48 am

Rustynut wrote:Do all M135i have the lsd as std.
No, £3k optional extra.

Maybe 1% of M135i have one, as a pure guess.
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