No always run chevron and no octane booster. My mechanic thought it might be a head gasket but then he was thinking why would all the plugs be reddish.he called his buddy at the BMW dealer and asked him and the guy told him it has to do with the trial bovand the jb4. I don't know what to do now.
2007 335I sedan (jb4,tial bov,afe intake)
01 cobra (novi 2000,nos,aftercooler,550rwp)
92 supra (1jz,regulus body kit 353 rwhp)
99 disco2 dd