This is with my '85 500SL.

I regularly help out a candidate running for a local office by driving my convertible in parades. Two weekends ago I was sent out to far Eastern Kansas for a parade, and fueled up at a small mom & pop looking gas station on the way home.

I have since noticed, though intermittently, white smoke, and my hand gets slightly damp when I hold it by the exhaust pipe. The smoke is odorless.

My heads were redone in 2002 with about 15k traveled since and my coolant levels/oil levels are normal. I'm curious if this is symptomatic of watered down fuel, and my options. I have about half a tank remaining, and am wondering if I should go to the effort of draining the fuel, or just topping it off with fresh fuel.

My main concern is that I first noticed it after some spirited driving, but I suspect a blown head gasket would be smoking constantly and consuming coolant, correct?

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!