I had a engine rebuild machine shop for 35 years , I can see where older design motors could benefit from some lube in the gas . but the Honda car and bikes run a long long time without wearing out the valve guide so I can't see using marvel oil in modern engines . if you want the best , use synthetic oil and shell ,chevron gas when you can. That gas has detergents in it to keep things clean .our local cheapest gas leaves huge deposits on intake valves. shell, chevron gas , valves look like new. I started in engine rebuild shop at 14 , worked with ww2 vets starting out. I've seen them put 1 quart of atf in crankcase during oil change along with new oil because of the detergents .sludge was real problem in those days .they did many other controversial things . we today have the best longest lasting gas engines in history. and the best oil in our history , take advantage of it !