Just got off the phone with Chevron tech about "diesel" oils and the detergents in their diesel oil. The detergents are not like Tide or Ajax laundry soap or whatever which wash the surface of something solid. Their detergent is formulated to suspend soot so there is no build-up. The tech guy assured me that there is no harm done running diesel oil in a gas, flat tappet cam engine concerning zinc or anything else. It is formulated to run in both diesel and gas engines. All Fleet Oil

Besides, it makes no sense to me for an oil company to put out an oil with relatively high levels of zinc, then add a detergent to basically wash it away from metal surfaces, now does it. That wouldn't bode well for their product, and Chevron Oils are high quality as well as others.

So again, show me hard data that shows diesel oil "washing" away the effectiveness of zinc in a gas engine.