Dura Lube Engine Treatment 32 oz is an advanced engine technology with SR3. Dura Lube Engine Treatment is precision blended to reduce friction and heat when added to any vehicle including gas diesel and hybrid engines. Dura Lube Engine Treatment works with all types of lubricants and oils including synthetics conventional and semi synthetic blends. It contains no solid materials so it will NOT clog filters. This product protects vital parts from wear adding a second layer of lubrication.