Differential oil front and back 420d xdrive 2018

daiBMW · 04-14-2026, 05:55 AM

Hi all,
I'm looking at changing front and back differential oil,
Just wondering if anyone can share any advice and links on what make and space people are using,
Many thanks

Kermit · 04-15-2026, 01:38 AM

I changed the rear diff oil recently. No drain plug so fiddly with syringe but totally doable on the driveway. Replaced with 2x 500ml of BMW oil (that you syringe back in).

I was expecting to have to remove the vibration damper but not required on my F31.

Solenoidal · 04-15-2026, 03:04 AM

Quote:

Originally Posted by daiBMW

Hi all,
I'm looking at changing front and back differential oil,
Just wondering if anyone can share any advice and links on what make and space people are using,
Many thanks

I used Febi Bilstein for my RWD F36, changed about 5000 miles ago. Put back in approximately 940ml before it started dripping out. You might need 2L for xDrive.

Autodoc:
https://m.autodoc.co.uk/febi-bilstein/9799721

04-14-2026, 05:55 AM	#1
daiBMW Registered 0 Rep 3 Posts Drives: bmw 3 series Join Date: Feb 2024 Location: Wales iTrader: (0)	Differential oil front and back 420d xdrive 2018 Hi all, I'm looking at changing front and back differential oil, Just wondering if anyone can share any advice and links on what make and space people are using, Many thanks
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04-15-2026, 01:38 AM	#2
Kermit First Lieutenant 147 Rep 328 Posts Drives: 335d xDrive Shadow Edition Join Date: May 2014 Location: Hampshire, UK iTrader: (0)	I changed the rear diff oil recently. No drain plug so fiddly with syringe but totally doable on the driveway. Replaced with 2x 500ml of BMW oil (that you syringe back in). I was expecting to have to remove the vibration damper but not required on my F31.
	Appreciate 1 danb19793639.50 Quote