Description STP Oil Treatment Diesel Engines – 300ml For extra engine protection. STP® Oil Treatment for Diesel Engines is designed to fortify motor oil with an extra measure of additives, providing increased levels of detergent/dispersant, viscosity improver, anti-wear and anti-friction agents. DIRECTIONS: One bottle of STP® Oil Treatment for Diesel Engines will treat 6 litres of diesel oil (5% treat rate). The entire bottle should be added to oil when the engine is warm (but not overfilled).
