Compression in gassers makes some heat, not as much as a diesel because of lower compression.
I had a VW bug that had two burnt exhaust valves. It was next to impossible to get it started in the winter. I was lucky to get it to fire on two cylinders. When engine warmed up, the other two cylinders would fire
Low compression caused by bad rings and valves allows condensation on spark plugs too.
I have a 20 hp kohler command. I had to grind valves on one cylinder to make it run properly. The bad cylinder would carbon up the plug, while the other plug was white as snow. Both cylinders use same carb. Compression test and leak down test showed the bad cylinder was good. It would only run on one cylinder when engine was cold, even in the summer.
I'm convinced a healthy engine will start in winter, others will have issues.
All my vehicles are 11 years old or less.. I bought them new and they have 90k miles or less and don't use a drop of oil. Start just fine in the winter.
My point is a healthy engine has no issues in sub zero without engine heaters. Can't say that about diesels. geo
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