The 2022 handbook is the first major AFTON publication to fully integrate the proposed API PC-12 (Category 12) for diesel engines. If you are formulating for North American heavy-duty trucks, the 2021 handbook lacks the critical oxidation and aeration limits introduced in the 2022 draft.
The is widely considered the definitive technical guide for professionals in the petroleum, refining, and fuel distribution industries. Afton Chemical, a subsidiary of NewMarket Corporation, is a global leader in fuel and lubricant additives. afton specification handbook 2022 link