There's a lot of oil on top of my engine. I will check the spark plug and head bolts for tightness when she cools down. I also have oil dripping out of the exhaust; not a lot, but enough of it to be a nuisance.
I ran 7 ounces in my first gallon. I'm going to lower that to 5 oz per gal.
I'm not sure if I even have a spark plug gasket; do they come with new sparkplugs?
No problem whatsoever, from 50 degrees F to 95 degrees F.
24:1 synthetic oil.
Proper mix of fuel and air. The plug stays clean and I have never even thought about "heat issues".