Mono Grade Break In Piston Engine Oil SAE 50AeroShell Oils are used primarily during break-in of most new or recently overhauled four-stroke cycle aviation piston engines. AeroShell straight mineral oils are blended from selected high viscosity index base stocks. These oils do not contain additives except for a small quantity of pour point depressant (which is added when improved fluidity at very low temperature is required) and an anti-oxidant.
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