Red Line 5W20 Racing Oil All Synthetic Formula This oil has many features that make it a good choice for kart racing, - Hihest film-strength available - Red Line contains PE polyol ester basestocks, which is the only lubricants capable of lubricating a modern jet turbine. - Withstands extreme temperatures - Greatest viscosity shear protection available - Extremly low friction coefficient (Super slippery) - Do Not Use for breaking in engines - Compatible with petroleums and synthetics Red Line does not contain detergents and is not recommended for street use.