I feel you. I wondered that same thing about marketing with them. Seems like they only carry Redline, they may have a contract with them or very well may just trust their products.
I am due for a change in about 500 miles. What are you running? I have always used 10w60 Motul in my past m3s with no issues and always seemed to run very smoothly, this m3 is new to me, has 25k miles and has BMW 10w60 now with the ceratec i added. I want to pick an oil and stick with it long term. I probably won't ever drive this in freezing temps but sometimes in 40 degree weather at the coldest.
10w60 motul or 15w50 redline are my two i am trying to decide between. I am not 100% behind what BW is claiming either. I like to go by what OEM recommends but the redline 15w50 oil specs look very good.
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