Castrol 06250 EDGE 5W-50 Advanced Full Synthetic Motor Oil, 1 Quart, 6 Pack Advanced premium full synthetic motor oil to offer strength under extreme pressure Titanium strong for maximum engine performance Reduces metal-to-metal contact across a range of different driving speeds Increased zinc levels for extra engine wear protection Exceptional protection for classic cars Recommended for older and classic car applications API SN Castrol recommends the use of Bosch oil filters