Playing around with my multimeter and thermocouple yesterday (Fri) and today. Caprice has an L67 3800 V-6 engine, mounted longitudinally, as was the way down here, 4L60E, and turns 1,700 RPM or thereabouts at 100km/hr. Holden specified 20W50 for the engine, and 15W40 for prolonged use in "snowing conditions"...it's snowing, and I've not used 50 grade oils for over a decade, 15W40 is what's in it while I'm doing short OCIs on my varnish removal experiment...probaly 5W40 synthetic, or 10W30 A3/B4 when I'm back to normal OCIs. My commute is around 10-12 minutes, mostly highway, 100km/h, 9 miles give or take. Bear in mind, only two days into playing. Yesterday (Friday) 3C, drove to work, pulled in, and measured 82C bulk oil temps. Drove home, and to stretch the friendship, and as there was a little traffic to keep 100km/hr as fast as it got, I kept it in "2", which held revs around the 4,000RPM mark. Revs are what heats oil, as the engine is working against the lubricant. On way home, could pull immediately off the highway just before hitting town...I was surprised that at very light load (albeit revs), I got 125C...bear in mind this was highway, and 3-4C, with a big winged alloy sump out in the breeze, little load. Two minutes across town, and it was down to 86C. Had to go out that way again today for kid's sports, snowed last night, little settled. 86C on the T/C when I parked. Couple hours later I drove the highway home, left it in "D" and recorded 105C at the same point I got 125 yesterday. slightly higher speed, much lower revs...thus the title of the thread...125C, at nearly no load, just valve burnoff type behaviour, and 125C Tooling around town to get groceries, hardware, etc. settled it at 90C. Will be keeping tabs on it over the next week or two, as I said, just for entertainment purposes, but keep in mind, the oil in bearings is 10-20C higher than the bulk. Checked the thermocouple in a pot of boiling water, and it registered 97C, so is accurate around that region.