I would be extremely careful and selective about additives, especially those placed in your High-RPM, High-Performance 4-stroke.
There should be no need for that type of additive if you are using the recommended lubricants, and the recommended service intervals.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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