Mowing would be a good exercise, I'm sure the pistons/cyl's have been well lubricated for a while.
A good workout should clear things up.
After you work it mowing, you will get a good idea of the engines actual condition.
The base of the aircleaner of a higher hour engine, can have a coating of oil on it, but not wet or dripping.
You will feel a little air coming out of the crankcase vent hose, but not a much.
You can finish the mowing season if all is well, and might think about cleaning the carbon out of the combustion chambers during the off season, but a lot of engines run just fine with carbon in them.
It might take several mowings depending on your acreage, to get the intake system free of oil residue.
Also I'm a big fan of precleaner foam sock around the paper air cleaner, and oil it!
I use FFT,( foam filter treatment) as it worked fantastic on my dirt bikes.
It pours on thinner than water, squeeze it out quickly and wallah, it changes viscosity to about heavy gear oil, and will not run off.
if you use it and see what the precleaner looks like after 1 mowing you will understand the job it does.
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