Quote:
Originally Posted by FSociety
Friend of mine been using Motul X-Cess 8100 5w40 on his past 2 M5/M6 S63TU, RS7 and blackstone came back with positive result. I would prob go with a Motul 8100 5w40 for summer and 0w40 for winter. There's an engine builder on BMW's V10 who swears on Redline 5w50
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0W flows better anyway why not run it full time ? Every cold start it will lube better. no matter the temp.