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Old 05-07-2021, 06:07 PM   #8
noobultimatum
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Member#: 431550
Join Date: Oct 2015
Location: South Florida
Vehicle:
2016 WRX
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Run a search on the forums. There are a few threads talking about this subject already that will help you understand dirty valves, walnut blasting, wmi...

Bottom line? Nothing will clean your valves completely except for WALNUT BLASTING THEM. Nothing.

WMI will help maintain the back of the valves by having something spray over the backs of them, but since it isnt spraying all the time, you will end up with build up.

DI motors all suffer from build up on the valves. It comes with the territory.
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