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Why is there still some varnish in the valve area after an Auto-Rx® cleaning?

April 26, 2017area auto-rx® cleaning valve varnish

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Why is there still some varnish in the valve area after an Auto-Rx® cleaning?

1 Answer

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Varnish is nothing more than a cosmetic stain; it does not affect the performance of the engine. Auto-Rx® does clean off the varnish, but due to varying engine designs, it is impossible to give an exact timeframe. Be assured that functional improvements have taken place when Auto-Rx® is used according to instructions.