Boost your vehicle's engine performance with the Shield Smoke Free Engine Oil Additive (500ml). This premium automotive chemical treatment is specifically engineered to reduce heavy exhaust smoke and stop oil consumption caused by burning oil in older or high-mileage engines.Its advanced DNA Engine Technology works by increasing the viscosity of your motor oil, creating a stronger seal between worn piston rings and cylinder walls. This process boosts low oil pressure, strengthens cylinder compression, and restores overall engine efficiency. Additionally, it helps cushion internal moving components to significantly quiet down loud engine noises. Safe for all petrol and diesel engines. Add one full bottle directly to your oil crankcase during every oil change. Brand new and sealed.