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Message: <blockquote data-quote="B33mEr" data-source="post: 407681" data-attributes="member: 13609">For rear axle you can use Redline 75W-90 gear oil while for your auto transmission you need to use BMW atf ONLY but here's the tricky part ... BMW have several gearbox made for them by a few company (GM, ZF and etc) so you need to find out which g/box you have on your car. The simplest solution is for you to give your VIN number to a BMW service centre and ask for a quotation for a transmission oil change, in the quotation it will list out everything for you <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />Ideally it's better if you flush and change your radiator coolant every two years. The ratio is 50/50.P/s: On every engine oil bottle it will list out the standards in which the oils conform too (e.g. LL01, MB236.14, SM rating and etc) and yes you're right do use Castrol whenever possible :top:</blockquote>