Castrol 6147 GTX 20W-50 Motor Oil, 1 Quart, 6 Pack Superior protection against engine sludge* *As measured in the Sequence VG Sludge test Advanced protection against viscosity and thermal breakdown Premium quality base oils and anti-wear additives to help extend the life of your engine Helps minimize oil consumption API SN/SM/SL/SJ Castrol recommends the use of Bosch oil filters