Stop oil burning and minimise exhaust smoke with Wynn’s Engine Oil Stop Smoke. The stop smoke formula is designed to prevent oil leaking past piston rings, causing smoke and increasing oil consumption. Wynn’s Engine Oil Stop Smoke will also help to improve oil viscosity and increasing oil protection. It is suitable to use in all vehicles including petrol, diesel and LPG and will mix with all oil types including mineral and synthetic. 1 bottle of Wynn’s engine oil stop smoke will treat up to 6L of engine oil is safe to use in vehicles fitted with Catalytic Converters and DPF’s.