AeroShell Piston Engine Oil 120, a straight mineral oil, is crafted from high viscosity index base stocks. These oils are additive-free except for a pour point depressant and an antioxidant to improve fluidity at low temperatures. This oil is primarily used during the break-in period of new or overhauled four-stroke aviation piston engines. Since break-in duration and lubrication guidelines vary, operators should consult the engine manufacturer or overhaul facility for specific recommendations.
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