Hello all, When I start my '89 Blazer 350TBI, the exhaust is quite visible (common in Michigan winters). But from my experiences, the exhaust usually disappears after the engine is warmed up. I can drive my Blazer for a while (definately warmed up) and still see significant exhaust. I don't think it's oil, as it doesn't look bluish/white or leave a trail when driving. Also my oil level and coolant levels stay pretty constant between oil changes. If it matters, I have dual exhaust. Maybe I'm just paranoid, but these things get to me. Any information would be appreciated. Thanks.