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I don't know about BMW but that may be why Mercedes changed thier oil spec around 2002 from petrol based to synthetic oil due to sludge formation. TSB S-B-18.00/16a.
I would think that even a very slight amount of sludge in an M type engine would be more critical due to the sensitive IMS bearing immersion in the sump oil.
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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