The 162FMJ uses thin paper head gaskets. The manual explicitly states: "Replace cylinder head gasket and base gasket after every removal." Reusing them is the #1 cause of coolant leaks (on oil-cooled variants) or compression loss.
If you have any more details about the application of the 162FMJ engine or your specific needs, I might be able to offer more targeted advice. 162fmj Engine Service Manual
Approximately 1,100 mL (1.1L) for a total fill; standard refill is usually around 1.0L. Oil Grade: 15W/40-SE four-stroke gasoline engine oil. Manufacturers like Alibaba experts The 162FMJ uses thin paper head gaskets