I got into a conversation at a weekly cruise Friday night about warmed up operating temps and engine wear with a guy whom I dont know well and he told me that the cooler the engine is when fully warmed up can wear the engine extreemly fast and should be at least 180 degrees to get the long life out of it. I am concerened because my big block runs at 160 degrees almost all the time. That is the thermostat that is in the car now, and it runs there most the time. If this is true am I looking at only 25,000 miles out of this or is he just mis informed. Shed some light.