Vehicle: 2003 VW GTI 1.8T Engine
Mileage: 113K miles
Purpose of additive use: Clean carbon from piston tops and clean injectors
Pre-Test Thickness/Coverage of Piston Tops' Carbon: Majority of piston tops' surfaces were covered with carbon with a thickness approximately equal to thickness of a penny. There were no areas of clean metal.
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Results: Approximately 50% of the piston tops' surfaces are now clean metal. The rest is a thin layer of carbon equal in thickness to one or a few pieces of paper. This means that the percent change in the volume of the carbon is much greater than 50% and that's what most matters. I have no idea how much injector cleaning occurred but considering how the piston tops cleaned up, I think that the injectors were cleaned too.
Conclusions: I am pleased with the results. Sure, I would have liked to see 100% clean metal on the pistons but the improvement I got was large. I bet that two treatments would make them almost completely clean.
Mileage: 113K miles
Purpose of additive use: Clean carbon from piston tops and clean injectors
Pre-Test Thickness/Coverage of Piston Tops' Carbon: Majority of piston tops' surfaces were covered with carbon with a thickness approximately equal to thickness of a penny. There were no areas of clean metal.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-==--=-
Results: Approximately 50% of the piston tops' surfaces are now clean metal. The rest is a thin layer of carbon equal in thickness to one or a few pieces of paper. This means that the percent change in the volume of the carbon is much greater than 50% and that's what most matters. I have no idea how much injector cleaning occurred but considering how the piston tops cleaned up, I think that the injectors were cleaned too.
Conclusions: I am pleased with the results. Sure, I would have liked to see 100% clean metal on the pistons but the improvement I got was large. I bet that two treatments would make them almost completely clean.