Shell Rotella T6 5W-40 Diesel Engine Oil is a full synthetic motor oil that features exclusive Triple Protection Plus technology, formulated with fully synthetic base oils plus advanced additives to protect against wear, deposits and oil breakdown PLUS better low temperature flow and increased fuel economy performance, without compromising durability, compared to conventional SAE 15W-40 oils. | Shell Rotella T6 5W-40 Heavy Duty Diesel Motor Oil | Size 1 gal