Actually, I'm not 100% sure it's oil smoke but it does look a little blue. My kids look at me in a strange way when they see me jump out of the car after I start it and stick my head in the smoke to get a lung full. Hard to say. Sadly, I do think it's lubricating oil burning but I could be wrong. In any case, it's smoking more than it used to but only on the first start of the day. I'm going to check my glow plugs make sure they'll all okay.
Dave

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1986 300SDL