AMERIGUARD® Premium Conventional 15W-40 CK-4 Heavy Duty Diesel Engine Oil uses the latest technology to exceed API and OEM specifications and deliver exceptional value. You and your vehicles work hard for the important things in life. Trust high-quality AMERIGUARD® Lubricants by Sapp Bros. to protect engines and your investment -- at an excellent value. Our engine oil is formulated to provide the following features and benefits:

• Up to 53% better wear protection.¹
• Outstanding control of friction and wear more than 65% better than the latest API requirements.²
• Up to 83% better oxidation control and 63% better deposit control.²
• Delivers long-lasting protection and control.
• Meet or exceed requirements of all major OEMs.

AMERIGUARD® HEAVY Duty Engine Oil is as Good as or Better than Other Top-Tier Brands.

The Facts are In the Test Numbers.

Applications

• This product and grade is recommended for naturally aspirated and turbocharged four-stroke diesel engines in which the API CK-4 service category is recommended. It is formulated for engines operating under severe service and a wide range of cold and hot temperatures.
• It is backward compatible for CJ-4 and older API service categories.
• Approved by or meets requirements of major OEMs such as Cummins, Detroit Diesel, Mack/Volvo, Paccar, Navistar, Caterpillar, and others.