The porsche crowd loves to use Chevron gas with techron-Then before an oil change you dump a whole bottle of techron in one tank of gas.
It gets by the rings and gets in the oil-thins it out. Do the oil change after that tank and off you go
everything is cleaned out and ready to go.

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2007 335i Alpine White(moms)
2006 X5 4.8iS Sapphire black(Mine)
2007 Porsche GT sliver GT3