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As far as cleaning the oil filter housing out with gasoline, the only problem would be the fire hazard, as long as you wipe it clean, so there us no great amount of gas left in the bottom. For the gasoline dumped in the filter housing to continue on to the governor, you'd have to fill the filter housing almost full, as the outlet to the governor is a tiny hole up near the top of the tube up the center of the housing. The only thing would be if you dumped a lot of gas in there and left it, it could flow back to the oil gallery, and into the pump, and flush the oil off the pump gears, making the pump have a hard time priming. If the housing is really dirty and needs cleaning, it's a simple matter to remove it and clean and dry it away from the tractor. There's no question the oil company is practicing CYA with that caution against synthetic oil. They don't want the possible liability of being blamed for every leak that the old tractor has, now and in the future. Furthermore, most of these engines have been overhauled many times over the years, and the seal materials are likely from a much more modern era than the date the tractor was manufactured. The bottom line is that if you personally want to run synthetic oil, it ain't gonna hurt a thing.
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