CamGuard is useful in ALL engines with ANY motor oil. It is especially valuable for marine and motorcycle, and (in a 5% ratio) two-stroke PWC applications. Infrequently used engines like typically found in GA, pleasure boats, motorcycles, jet skis, and in agricultural equipment will be the greatest benefactors as CamGuard boosts the anti-wear and anti-corrosion benefits off the charts (when compared to non-treated oils) in a lab tests duplicating these harsh operating environments Note: Use 5% CamGuard in your two stroke oil supply. Be mindful to consider the pre-existing oil in oil reservoir oil injection type systems when calculating your desired 5% ratio.