Rotella T5 Synthetic Blend Diesel Motor Oil, 15W-40 CK-4, 1 Gallon - Pack of 3 Triple Protection Plus technology protects against wear, deposits and oil breakdown plus provides better low temperature flow compared to SAE 15W-40 oils Helps control engine deposits for reliability at extended oil drain intervals Formulated to control engine wear, 37% better than the maximum wear requirements in API CK-4 engine wear tests Heavy duty engine oil formulated with synthetic base oil components Delivers improved oxidation performance for increased resistance to breakdown under high temperatures compared to the previous formulation