Any CJ-4 or CK-4 rated oil, preferably full synthetic, in 0W-40, 5W-40, or 15W-40…
The “C” stands for Compression…
The “J” or “K” is the version,
and the 4 is for 4 stroke, I believe.
The first number is viscosity when cold, hence the “W” after..
The second number is viscosity when hot…
This...