Changed diff oil last summer and had to stick to OEM, since I could not find the FM booster anywhere. BMW sells it already mixed, in 1/2L bottles. 1.5L is enough.
Diff oil Synchromax- Royal Purple max-gear high performance gear oil SAE 75w-140
Gearbox Synchromax Royal Purple synthetic high performance manual transmission fluid
Iridium Engineering
Its American and purple and it comes in quarts speak to Shaun-running it in my S54.
Jack the car up, on the lower part of the cover panel there is a large allen key bolt, undo that and the old fluid will drain out.
I would replace the bolt or at least the washer at this point to save any future leaks.
Higher up the rear cover there is an identical allen key bolt, undo that and squeeze the new fluid in, you may need a pump depending on the nozzle that comes with your new fluid bottle.
No more than a 30 min job, depending on if you can be bothered it might just be easier to pay half an hours labour for any garage to do it for you
I might be wrong here, but I seem to remember somebody on here suggesting you loosen the upper bolt before draining the oil from the lower bolt hole... just in case you can't get the top bolt out leaving you with an empty diff
Not actually in the least bit fat
2000 S50 Titanium Silver / Black
ACS Suspension, Exhaust & Type III Wheels
Simota carbon air intake | Strong Strut Front Brace
Interesting about loosening the top bolt first,having just serviced an outboard engine ready for the start of the diving season,you actually fill the gearbox from the bottom hole untill the oil comes out of the top which is why i asked in the first place! i will order new bolts too aswell as the oil from bmw.thanks a lot.
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