AMSOIL Signature Series 0W-40 (AZF) is now recommended for applications that call for the Chrysler MS-A0921 specification.
This specification covers many newer Dodge SRT street-performance vehicles like the Challenger and Charger SRT equipped with the 6.2L Hellcat engine as well as Ram TRX (6.2L) and HD models such as the 2500 and 3500 series trucks equipped with the 6.4L Hemi.
Signature Series 100% Synthetic Motor Oil
1Based on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.
2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
3Based upon independent testing of Mobil 1 Annual Protection Full Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased in July 2020.