Lucas High TBN SAE 15W-40 Truck Oil is a blend of high quality base oils and an additive package that allows extended drain intervals and a much higher degree of protection from metal to metal contact. This product is excellent for gasoline engines. The user can expect the following: 1. EXTENDED DRAIN INTERVALS--UP TO TWICE AS LONG. After 20,000 miles, sample oil every 5,000 miles to determine maximum oil life for each particular engine. 2. ELIMINATION OF DRY STARTS. The exclusive additive package ensures a protective film on parts at all times. 3. LOWER OPERATING TEMPERATURES. Normal oil temperature will be lower but more importantly, the additive film in Lucas SAE 15W-40 will not rupture in an over-heating situation. 4. EXTENDED PROTECTION FROM FUEL DILUTION. The additive package is more resistant to break down from the solvents in diesel fuel than common additive packages found in regular 15W-40 blends. 5. HIGH DETERGENT ACTION. Motor oil is usually changed because it's contaminated with combustion by-products, not because it's worn out. The high detergent action of Lucas SAE 15W-40 allows up to twice as much contamination to be held in suspension and still have good lubrication qualities. 6. A HIGHER DEGREE OF LUBRICITY. The slicker the oil, the easier the engine starts and the easier it runs. 7. HIGHER OIL PRESSURE. This means more protection and more cooling. 8. LESS OIL CONSUMPTION. The low volatility of Lucas SAE 15W-40 Truck Oil makes it harder to burn. The thicker oil film makes it harder for the oil to get past the rings to the combustion chamber. 9. MORE PROTECTION FOR OLDER ENGINES. Common engine oils are formulated for the tolerances of new engines only. The extra additives coat the parts with a heavy film that compensates for the extra space between the moving parts in older engines.