How To Change Your Diff Oil

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marco_polo
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How To Change Your Diff Oil

Post by marco_polo » Sun Sep 20, 2015 4:29 pm

As requested by a couple of people....

This is a guide for changing your differential oil, this relates directly to a M135i, but I'm sure it would be a very similar procedure for any BMW. I did mine laying behind my car in the street in a few minutes.

Before you start, you'll need a litre of GL5 diff oil; a pair of rubber gloves (unless you prefer the spare bed), a 14mm Allen Key or similar; something to catch the old oil in; and tool/method for refilling the diff, here's my kit:
photo 2 20_zpsyvqxjttq.JPG
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(I'm using 75w140 LSD oil for my clutch-type Drexler LSD, but) 99.9% of people will need a 75w90 GL5 (including Quaifes). Notice the Oil Gun, basically a big syringe, which makes things very easy. About £5 on fleaBay.

I'm fitting a Magnetic 'Dimple' diff plug today, M22x1.5mm, 9mm thread. https://shop.motorsport-developments.co ... -350-p.asp. This is particularly important if you fit a Quaife, as they're known to create quite a bit of metal dwarf inside when running in from new.
Diff 2.jpg
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Start by popping your gloves on (old gear oil is nasty stinky stuff). Position a tray / plastic sheet under the diff ( to save your driveway - although you really won't drop much ) then remove the plug.
photo 3 12_zpsiuqgntdf.JPG
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Next, suck the old oil out using the suction gun. After only 20k, mine was pitch black and a bit thin. It's doubtful you'll get 100% of the old oil out, but 900ml is easy enough to extract in 4 or 5 pulls.
Diff 3.jpg
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Bear cleanliness in mind, you don't want to knock any crud inside at any stage, or you could do more harm than good.

Refill the diff with roughly 1 litre of nice new golden oil. :) I simply sucked it out of the bottle, and blew it into the fill hole. When it's full, it will just start trickling out again.

Refit your plug and torque to 60Nm / 44 lbft, done!
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - TMC Piggyback - M4 LCA's - aFe Dry Filter

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Re: How To Change Your Diff Oil

Post by rob180bhp » Sun Sep 20, 2015 9:31 pm

Excellent write up :)

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Re: How To Change Your Diff Oil

Post by marco_polo » Sun Sep 20, 2015 9:43 pm

Cheers Robbles.

I'm doing this LSD every 20k, but for a standard open diff I usually leave it somewhere between 33k - 50k.

Basic routine maintenance, far cheaper and easier than £1000 for a new diff! Especially important if you have a car with a known weak diff, like the 2004 - 2006 118d.
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - TMC Piggyback - M4 LCA's - aFe Dry Filter

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Re: How To Change Your Diff Oil

Post by bgkz25 » Mon Sep 21, 2015 1:01 am

Thanks for this marco_polo!

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Re: How To Change Your Diff Oil

Post by Paulc67 » Tue Sep 22, 2015 9:22 pm

Great post, I'm not confident enough to do it myself but it is number 1 on my list to do

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Re: How To Change Your Diff Oil

Post by Octavius » Tue Sep 22, 2015 9:37 pm

One thing to add, Marco please forgive me. Get the diff up to operational temp before you change the oil.
Don't know why, just recommend to do it that way. Probably to do with the viscosity of the oil.
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Re: How To Change Your Diff Oil

Post by marco_polo » Tue Sep 22, 2015 9:51 pm

:? The oil sucks out pretty easily even when cold? It's not like an engine where you want it to drain out of all the fine galleries?

I could understand giving it a high speed run directly before hand (to stir all the crap up from the bottom into suspension), but I'm not convinced working on a hot diff is better / easier?
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Re: How To Change Your Diff Oil

Post by Octavius » Tue Sep 22, 2015 10:38 pm

marco_polo wrote: :? The oil sucks out pretty easily even when cold? It's not like an engine where you want it to drain out of all the fine galleries?

I could understand giving it a high speed run directly before hand (to stir all the crap up from the bottom into suspension), but I'm not convinced working on a hot diff is better / easier?
Not as hot as an engine or sump when doing an oil change ?
Each to their own I suppose but as you say and I agree the sediment needs mixed with the oil if the car has stood for a while as there is no separate drain plug. It would be even better if the diff could be flushed completely as they do with some of the Hondas, Three times in total to clear all the debris out.
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Re: How To Change Your Diff Oil

Post by Sanesh21 » Wed Sep 23, 2015 5:17 am

Thanks marco


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Re: How To Change Your Diff Oil

Post by gsal » Fri Oct 09, 2015 6:11 pm

I dont want to sound like an idiot but I have a 2011 118d m sport, what diff do I have in mine?
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Re: How To Change Your Diff Oil

Post by Octavius » Fri Oct 09, 2015 6:16 pm

What diff or what oil :?:
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Re: How To Change Your Diff Oil

Post by gsal » Fri Oct 09, 2015 6:38 pm

Is mine a lsd or standard or are they the same?
BMW 2011 118d M-sport.

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Re: How To Change Your Diff Oil

Post by marco_polo » Fri Oct 09, 2015 6:40 pm

The only 1er to get an LSD as standard was the 1M Coupe. You'll have a standard open diff, unless someone's been fiddling.
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - TMC Piggyback - M4 LCA's - aFe Dry Filter

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Re: How To Change Your Diff Oil

Post by gsal » Fri Oct 09, 2015 6:42 pm

Thank you for the quick response, I will change that oil over the weekend weather dependant.
BMW 2011 118d M-sport.

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Re: How To Change Your Diff Oil

Post by gsal » Fri Oct 09, 2015 7:04 pm

Sorry, just one more thing is it best to use synthetic, semi synthetic etc?
BMW 2011 118d M-sport.

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