It burns oil and Gas :-) JK Are you sure its not soot? Also are your sure its not just blow by as the motor heats up? Forged Pistons do tend to allow a more blow by to happen while the heat up and expand. FYI I get blow by as well on my car as well until it properly heats up.. Here is a good article on Pistons fairly old tho. [ http://www.hotrod.com/how-to/engine/mopp-081008-mahle-piston-alloy-comparison/ ]
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