AeroShell W Oils were the first non-ash dispersant oils to be used in aircraft piston engines. They combine non-metallic additives with selected high viscosity index base stocks to give exceptional stability, dispersancy, and anti-foaming performance. These additives leave no metallic ash residues that can lead to deposit formation in combustion chambers and on spark plugs, which can cause pre-ignition and possible engine failure. U.S. Approved J-1899 SAE Grade 50, British Approved J-1899 SAE Grade 50, French (AIR 3570 Grade SAE 50), Russian MS-20 NATO Code O-125 (Obsolete), Joint Service Designation OMD-250
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