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I have posted here before with concerns about using Valvoline Synthetic 20W50 racing oil (black bottle) in my Kawasaki engine. Pretty much everyone who replied said there is no need to worry. However, I was just on another website (engineoiilcapacity.com/kawasaki-fr651v-engine-oil-type/) which...

I read some info on this oil and liked that it has a high zinc content for added anti-wear protection. So i called Valvoline and spoke to a rep there to ask if this oil is safe to use in my two small lawnmower engines (Honda 160cc and Kawasaki twin cylinder FR651V.) As of today, the Honda has...