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Last oil I bought was some 1 gallon jugs of DP semi-synthetic 15W40 from tractor supply, marked down to $10 per gallon about a month ago. I bought all 6 gallons they had in the markdown section. (Had Heavy-D from youboob on the label?) it's off brand, and I don't see it on the website, but...

Agreed. Oil in any engine that has been run should be changed yearly, no matter how many miles they are supposed to last. Even engines that burn fuel like propane or natural gas still have combustion byproducts that get into the oil and can cause issues over time.

Synthetic oils are a whole different thing than conventional. Many synthetic oils are engineered in such a way that for multi viscosity ratings, they don't have to add anything to lower the first number. They handle the heat and stress inside the engine much better than their conventional...

first number is how it flows at very cold temp. Second number is how it flows at operating temperature. Sure you can run 5W40, but in conventional oils they have to use additives to modify the flow characteristics at cold temps. The further apart the two numbers are is also directly related to...