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drolston · 11-03-2020, 04:10 PM

I am running a higher lift cam and Zephyr valve springs, so I feel more comfortable with more zinc than regular API oil. My solution: one quart of Valvoline TR1 racing oil for the zinc, three quarts of any good API oil for the detergent, and a pint of Marvel Mystery Oil because every flathead guru I have ever known says it works.

11-03-2020, 04:10 PM	#12
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,627	Re: ZDDP oil additive I am running a higher lift cam and Zephyr valve springs, so I feel more comfortable with more zinc than regular API oil. My solution: one quart of Valvoline TR1 racing oil for the zinc, three quarts of any good API oil for the detergent, and a pint of Marvel Mystery Oil because every flathead guru I have ever known says it works.