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WHN · 03-27-2021, 06:27 AM

We have used for years in our gas only. It has really done a good job at reducing valve noise on older engines.

Having said that. I would not add to my engine oil. Drop the oil pan and clean everything including the oil pump completely. Than I would just start using a good quality high detergent oil, and change often.

Enjoy.

03-27-2021, 06:27 AM	#5
WHN Senior Member Join Date: Mar 2017 Location: Connecticut Shoreline Posts: 1,824	Re: Marvel Mystery Oil in Crankcase We have used for years in our gas only. It has really done a good job at reducing valve noise on older engines. Having said that. I would not add to my engine oil. Drop the oil pan and clean everything including the oil pump completely. Than I would just start using a good quality high detergent oil, and change often. Enjoy.