05-05-2022, 09:46 AM
Warm up was traditon for decades. Then in the early 50s doing tests with radioactive rings it was determined that cyl wear almost ceased (as moderns) when fully warmed and it was reckoned better to drive away (reasonably) and so hasten the process. Modern oils and regular longish runs seem to hold off early mains wear. My car shows cyl wear after about 15,000 despite a lot of main road running; I suspect most of the time the block was too cold. From older books at least, it seems likely a thermostat will reduce wear more than any exotic oils.