An ashless (non-ash dispersant) oil developed for aviation piston engines, combining non-metallic additives with a high-viscosity-index base oil, formulated for 4-stroke certified reciprocating piston engines. Corresponds to SAE J-1899 Grade 50.
US J-1899 SAE Grade 40 · UK J-1899 SAE Grade 40 · FAA Airworthiness Directive 80-04-03 R2
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