[LWHiway]

Down south oilburning engines are used for mosquito abatement. Not really.

For the Dodge diesel I use Rotella. Consumption is way down, due to the specific additives I'm sure. 280k plus miles and still the belts squeal when I turn off the ignition. Used this oil from day one at first oil change.

For the mowers on the farm, lawn, I use synthetic. I noticed back in the 70's when using a particularly older mower, it was smoking a lot. It was 20+ yrs old then. I was using synthetic in my Harley and dumped some in the mower. After topping off the oil a few times, the blow by all but stopped. No noticable smoke in the exhaust. Of course a valve seat knurl and valve change stopped it completely. Started using it in all of them and have had good/great success.

Synthetics are more expensive, but I think they do just fine.