Amsoil signature series Max duty synthetic diesel oil and heavy-duty synthetic diesel oil exceed the latest API CK-4 specification and represent a serious upgrade in superior diesel protection and performance compared to oils formulated for previous API diesel oil specification, including API CJ-4 and CI–4

• More piston scuffing protection for reduced wear
• Better thermal control to resist oil thickening, a in cooling and reduce wear
• Improved shear stability for maximum resistance to oil consumption and wear
• Enhanced aeration control, promoting oil pump efficiency, wear protection and heat resistance.

API CK–4 diesel oils are backward compatible meaning they are recommended in all applications specifying API CJ–4 and prior specifications. Amsoil signature series Max duty synthetic diesel oil

Signature series Max duty synthetic diesel oil represents the top tier of Amsoil protection and performance for diesel engines.

• 6X more engine protection
• Reduced oil consumption
• Top grade protection for extended drain intervals
• Available in 5W-30, 0W-40, 5W-40, and 15W-40 viscosities

Amsoil heavy-duty synthetic diesel oil

Heavy-duty synthetic diesel oil provides outstanding protection and performance for customers seeking an upgrade over conventional and other synthetic diesel oils.                                                                                                                      

• 4X more engine protection
• Reduced oil consumption
• Outstanding protection for OEM recommended drain intervals
• Available in10W-30, 5W-40, and 15W-40 viscosities