
An ashless dispersant oil developed specifically for aviation piston engines, combining non-metallic additives with a high-viscosity-index base oil for stability and anti-foaming performance. It leaves no metallic ash residue, reducing the risk of combustion-chamber and spark-plug deposits.
US J-1966 SAE Grade 40 (cross-referenced as J-1966 SAE Grade 30) · Joint Service Designation OM-170 (Obsolete)
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