What specifications are used to qualify piston engine oils?
The two SAE specifications used are: SAE J1899 (formerly MIL-L-22851) – Ashless Dispersant oils SAE J1966 (formerly MIL-L-6082) – Straight grade mineral oils The military specifications were superseded by the SAE specifications in the late 1990s. Reference is likely to be made to the military specifications for many years to come as they are embedded in the industry. Qualification against one of these specifications is only achieved after an extensive test programme overseen by the US Navy. This begins with laboratory testing, progresses to a 150 hour engine test before finally being evaluated on wing. All Castrol piston engine oils meet these specifications The Castrol Aviator S straight grades meet the SAE J1966 specification. The Castrol Aviator AD Ashless Dispersant grades and the Multigrade meet the SAE J1899 specification.
