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According to my owners manuel the spark plug gap is 30
.030"
My book for my John Deere snowblower , which has a 5 horsepower Tecumseh engine , shows to use the Champion RJ17LM spark plug
.030
The spark plug should be gaped at .030"(76mm)
11/64"
A Champion CJ8Y or J19LM will perform fine
0.030" for a champion or 0.020" for NGK and others.
10w40 will work fine!
Depending on the model, it could differ, but the most common would be the champion CJ8 spark plug, or similar, double check at your parts store before you buy.
10w40 motor oil will work fine!
spark plug gap, gas/air mixture on carb.