Two new API diesel specifications by the industry prompted AMSOIL to introduce some new formulations to the market.
The new API diesel oil specifications focuses on these five objectives:
Improved fuel economy
Stronger oxidation stability
Better shear stability
Increased resistance to aeration
The new API CK-4 specification is designed for current model-year and older diesel engines and is backward-compatible with the older API CJ-4 (and prior) oils.
The new API FA-4 specification is designed to further improve fuel economy and reduce emissions. However API FA-4 oils is not backward-compatible and should only be used in certain 2017 and newer over-the-road trucks, when approved by the original equipment manufacturer (OEM).
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil
Just [ike Amsoil Signature Series Synthetic Motor Oil for gasoline engines, Amsoil Signature Series Max-Duty Synthetic Diesel Oil represents the top tier of AMSOIL diesel protection and performance for diesel engines. It is available in 5W-40 and 15W-40 viscosities, as well as the newer 0W-40 and 5W-30 viscosities.
Max-Duty engine protection and performance
Significantly exceed industry requirements
Full OEM specification coverage
Reduced oil consumption
Extended drain intervals, including reintroduction of 25,000-mile/one-year drain intervals for turbodiesel trucks.
Signature Series 5W-30 Max-Duty Synthetic Diesel Oil was formulated as a premium all-fleet motor oil engineered for modern diesel and gasoline engines as well.
Meets the latest diesel and gasoline oil specifications, including API CK-4 and API SN
Low viscosity delivers protection equal to higher viscosity engine oils
AMSOIL Heavy-Duty Synthetic Diesel Oil
AMSOIL Heavy-Duty Synthetic Diesel Oil provides outstanding protection and performance for customers seeking an upgrade over conventional and synthetic-blend diesel oils. AMSOIL Heavy-Duty Synthetic Diesel Oil is available in 15W-40 and 10W-30 viscosities, as well as a new 5W-40 viscosity.