A little OT. When I lived in North Dakota and operated a garbage business. The truck I had was a Ford F600 with a 390 gas engine. Back then, we used straight SAE30 weight oil. At -35°F, a block heater would keep the engine warm enough so that starting and wear was not a problem. We got 150K miles out of that truck. But, to add oil to the engine at that temperature, we had to scoop the oil out of the drum with a trowel and put it in an empty coffee can in front of a kerosene heater to get it fluid enough to pour. Also, you had to play with the PTO at first start. If you simply put the PTO in gear and released the clutch, the SAE10 weight hydraulic oil would be so stiff it would kill the engine. You had to repeatedly apply and release the clutch to get the oil moving.