Castrol GTX Full Synthetic 5W-30 Motor Oil, 5 Quarts

Superior wear protection on critical engine parts
6X better wear protection than industry standards, as measured in the latest Sequence IVA test
Superior sludge cleaning and protection against new formation
1.3X better sludge protection than industry standards, as measured in Sequence VH sludge test vs. API SP limits
Full synthetic formula provides thermal and oxidation stability