The E92 M3 service book actually says the S65 comes with a non-synthetic break-in oil. TWS, at least in my S62, sheared down to about 17.4 CST at 100c, so this is actually thicker than TWS.Nothing remarkable here other than the possiblity that the M3 doesn't come with standard Castrol TWS 10W-60 oil. For somebody's future reference
Don't forget that the M engines have a different piston ring structure - they are much looser when the engine is cold to allow for expansion due to friction at very high revs. That's why M cars use more oil, and if driven aggressively will need the oil changed more frequently.Thanks for the analysis. Looks like you should shoot for another oil change around 5k miles or so? It's hard to imagine BMW letting their non-M engines go for over 15k miles on the initial fill.