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Originally Posted by Assimilator1
Aren't the other grade oils only to be allowed for top up purposes? Also, BE state to stick with 10w60, so unless you have really cold winters I wouldn't use 5w50 now. Oil pressure hasn't been tested with BE bearings and 5w50, so who knows if it would be ok or not! Maybe it would, maybe it wouldn't. Care to be a guinea pig and report back over the years? I'd at least hook up an oil pressure gauge!  PS their is a thread discussing 5w50 for these engines , this one https://www.m3post.com/forums/showthread.php?t=1592340 |
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You're right, the other grade oils are for the addition of small quantities only (top up). It's covered on page 206 of the attached owner's manual. I used to top up 10W60 with M1 0W40 and recently ran (made the switch) to M1 5W50 for 18 months prior to the BE bearings install. Many folks have run the 0W40 M1 -> BUT with the OEM bearings. However, the M1 0W40 increased oil consumption over the 10W60 TWS - especially on longer journeys - if I recall correctly. So I'll just stick to the 10W60 now with the BE bearings.
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