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:

• Reduced emissions

• 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 they become officially approved by the original equipment manufacturer (OEM).

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil

Just like 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

• Emissions-system compliant

• Low viscosity delivers protection equal to higher viscosity engine oils

AMSOIL Heavy-Duty Synthetic Diesel Oil

The 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.

• Heavy-duty engine protection and performance

• Excellent opportunity for price-conscious customers to move up to AMSOIL quality

• Reduced oil consumption