This is a pretty good carbon remover. Those little liters you buy at the parts store to add dirt to you are useless. Get something like this! Did Toyota/Lexus burn oil in the early to mid 2000s? This will clean burned piston rings fairly well. Want to keep that old turbocharged Volvo running longer? It's a thing in Turbo Hyundai/Kia all the way down to the old-school V8. Clogged inspection holes and passageways don't last as long. Not difficult if you want to keep engines with deposit problems like Chrysler 2.7 V6, 1.8t VW/Audi, '97-2010 Toyota and Ecotecs at GM.
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