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      12-18-2013, 11:18 PM   #7
dparm
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Drives: 2011.5 E90 M3
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They're clearly different just looking at the bottle. Edge Professional TWS is the newer formula, hence API SN (versus SJ). Overall it's a stouter formula -- higher flashpoint and stronger additive pack. Also worth noting is that it appears to be about 10% thinner. TWS Motorsport is basically the old formula.

I would've been interested to see virgin/starting TAN.
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2011.5 AW M3 sedan ZCP