JOHN L. - I have a little two-part test for you to do about how much good a 200-300 watt elec. oil pan heater can do on a 1-cyl air-cooled Kohler splash lubed engine.
Pour a whole bottle of KARO corn syrup, the THICK stuff in a bowl. Then put the bowl in the fridge for an hour or two. Then throw a tennis ball or something like it into the bowl and see how much of the syrup splashes out.... NONE, or at least very little. Then pour a whole bottle of vegetable oil in a bowl, throw the tennis ball into it... then wipe up the mess.
Now flick your finger into the KARO syrup, your finger is the finger on the rod cap stirring up the oil to lube your Kohler when it first starts when it's cold. Now flick your finger in the veg. oil.
Yes, I bought my 200W mag. heater 30 yrs ago when my CC had to start in a cold shop to move snow. I had a 75,000 BTU kerosene heater in a 8 ft X 16 ft x 7 ft tall shop, I could have had the shop up to 80 degrees in a half hour, but I needed WARM OIL so it would splash around. Cold oil does NOT splash. If I had a hydro, I'd have a heater for both the engine & trans. The mag heaters work great on 7,8, & 10 HP engines, not so good on the 12, 14, & 16 HP engines since they dont have flat oil pans.
I saw a discussion on another forum about a higher incidence of diesel fuel gelling this winter than in past winters. Bio-diesel was the blame, or at least accused of being the problem. My diesel p/u was my daily driver for nine years, then my snow day back-up vehicle for four more years, and the bad snowy day vehicle for the last five winters. It's NEVER gelled up even when below zero. I bought winter blean fuel plus when temps were to get around Zero, I'd add de-geller, Power Service additive. Even 30+ yrs ago when I drove semi trucks I NEVER had a truck gell up on me. The problem of diesel's gelling up is vastly over-blown. It happens, but a tiny bit of preparation prevents it.
AMY K. - My $0.02 worth on your new tires.... I'd maybe add windshield washer fluid to your old turf tires if they have inner tubes in them. Modify your old truck chains to fit your CC's rear tires. I have an all concrete driveway and I can push more snow with a snow shovel than my 6000 and 7000 pound full size farm tractors can without chains. LUGGED tires are terrible on concrete when pushing snow. Once you spin a tire the least little bit, you form ice under the tire and your traction disappears. The scratches on concrete from the chains fade after a few months.
Like Don T says, and ATV tire may work better than a garden tractor tire, but an ATV tends to use speed and momentum to move snow where a garden tractor uses slower speed and traction to maintain it's pushing power. I'd like to see someone try a "Winter Tire" like a Bridgestone BLIZZAK on a garden tractor. They have a super-soft tread rubber, about like a pencil eraser. They would be much better than a plain turf tire, or lug tire, but not sure if they would be as good as a pair of chains, I kinda doubt it.