AMSOIL 0W-20 (ASM), 5W-20 (ALM), 5W-30 (ASL) and 10W-30 (ATM) Synthetic Motor Oils join AMSOIL Signature Series 0W-30 to round out the new Signature Series line. Signature Series 0W-30 is now identified by product code AZO. Product code SSO will be discontinued and is only available while supplies last.

In addition to being reformulated to meet the latest API SN Resource Conserving and ILSAC GF-5 industry specifications, the new Signature Series line features all-new packaging and represents the very best motor oils AMSOIL has to offer, allowing motorists to take advantage of maximum extended drain intervals. In the interest of consistency and clarity within the Signature Series line, all five motor oils are recommended for drain intervals of up to 25,000 miles/one year, whichever comes first (15,000 miles/one year in severe service conditions).

The new Signature Series line is replacing the previous formulations of the AMSOIL top-tier oils as inventories dictate; orders will be filled with the older formulations and packaging until inventory is depleted, which may occur at varying times for each viscosity. The former Signature Series 0W-30 formulation (SSO) is available while supplies last.