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Thread: OIL Types Used
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Old 11-29-2012, 08:38 AM
robertobaggio20 robertobaggio20 is offline
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Originally Posted by nwilson44 View Post
This is a good question as I have no clue what the factory specifications are for oil weights. I simply used 20w-50 royal purple. (High performance fully synthetic oil) in my 1995 540i

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Have you ever tried anything else ? Switch to RP 10w40 and see if your car feels the same or better (test it at all speeds). If the performance feels the same, then monitor fuel economy over 2 tankfuls. If its better, then switch to this permanently. 20w50 helps high mileage vehicles better but being thicker, it generates more friction within the engine which results in power loss from that aspect alone.
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