i would run it for awhile and if it's only on start up or from sitting after being ran hard then one of the turbos may have a slow leak and letting oil get in the exhaust mine is the same and am going to do a turbo rebuild.
ive got much less black in back .(hehe) anyhow i messed with my safc settings and such and now i have to rerun a wideband o2 on it sometime this week ..then im sure ill be much better off. thanx guys.
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