The only time I notice the smoke is after having driven 70-90 mph on the freeway, exiting and coming to a complete stop at the light, then upon take off a huge cloud of grayish smoke leaves my exhaust.

I just had my fuel mixture adjusted and don't recall noticing it before this. Did my mechanic just do it incorrectly? I have replaced the head gasket so thats not it.

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90 560SEL
H&R springs
17" Alba Frontiers
Cross drilled rotors
Magnaflow Cat
European Headlights
WALD front bumper
Keyless Entry
Burlwood shiftknob
Clear corners, taillights
Limo tint
2 JL 12W6's, JBL BP1200.1, Pioneer P8200R