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My F11 was at the garage today for a few things including a change of diff oil. A few hours after dropping the car off the garage rang to say they'd done everything apart from the diff oil. They'd been in touch with BMW re the oil and been told they need to use the genuine BMW oil at £80 per litre, BMW refused to tell them the spec of their oil, only offering the part number saying that that is the only oil which can be used in my car and anything else will result in irreparable damage. The garage wanted to check that was ok with me before going ahead. I told them not to bother for now and after a brief search on here see others ( @sams255 and @Munzy123 ) have used SAE 75/90 oils from Motul and Castrol. How did those work for you guys? Did your diffs explode soon after? Have you done lots of mileage without any apparent consequences? Would I be correct in thinking any SAE75/90 oil from a reputable company should be just fine and I should just buy some Castrol/Shell/Motul etc and ask the garage to use that? I'd be tempted to have a go at the job myself but don't have any level ground near home which seems to be an important requirement it you want to be sure of filling with the correct amount of oil.