Originally Posted by rvacha
I shoulda been clearer - sorry. TWS is $9/liter, I use Mobile 1 20W-50 and half the BMW service interval
Is Mobil 1 approved by BMW? I know on the E46 M3 it was not. Personally, I would not risk warranty to save $35 per oil change. I do in-between changes, as well, but only with TWS.