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Message: <blockquote data-quote="Rick1" data-source="post: 751762" data-attributes="member: 43572">5W-40 is correct for your car assuming it is a fully synthetic and is to BMW standard ll-01. 15W-50 is not correct for these engines.For info, the numbers that oils are referred to are the viscosity (thickness) of the oil at certain temperatures so in a case of 5W-40 at cold temperatures the oil must not have a higher viscosity that 5 and at 100'c the oil must be 40 viscosity. In Malaysia the W (cold thickness) is not an issue as the ambient temperature is always above 24'c, the important code for Malaysia is the higher number, in this case 40. A 15W-50 oil is not correct for a BMW with an M54 engine.</blockquote>