SR-5 offers the highest level of performance in the Torco Super Street Series line of motor oils. It is a combination of Group IV PAO and Group V Ester base oils. SR-5 incorporates the same advanced additive system as in the SR-1 covering specifications for Domestic, Asian, and European vehicles. SR-5 can extend oil changes up to 15,000 miles. Available in 5W-30 and 5W-40.