Not sure about alternative oils. New to my M5 - only had it a couple of months. Also worried that it may effect my BMwarranty if I use a non-standard oil.
this has been a very touchy matter for some.. but the general consensus is cars before MY2001 its better to stick to bmw's recommened 10w60 Castrol TWS, and cars after 2001, its better to get Castrol TWS 5w60...
He's a link from fellow board member Mohan, on getting cheaper oil.. clickyclicky for oil
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