Safe for catalytic converters and oxygen sensors. Added to gas it cleans and lubricates fuel injectors and carburetors, improves gasoline mileage and extends spark plug life. Reduces and prevents varnish and gum build-up. Added to oil it prevents valve sticking and clatter, fortifies properties of engine oil, prevents breakdown caused by extreme temperatures, reduces and prevents acid and sludge formation and promotes easier cold weather starts.

Shell Rotella? T4 Triple Protection? is the same Triple Protection? technology customers have come to depend on. But today, it's better than ever, with advanced additive technology that adapts to your driving conditions to protect against wear, deposits and oil breakdown.

Shell Rotella? T4 Triple protection 15W-40 is designed to provide hardworking protection that adapts to your driving conditions. With millions of miles of real world testing, Shell Rotella? T4 Triple protection 15W-40 uses a proprietary formula exclusive to Shell. It is designed to protect under the most severe engine conditions found in modern low-emission engines and older hard working diesel engines.