Oh yeah, I learned a long time ago that you should never rev up a cold engine. And that hot water temp doesn't mean hot oil temp. Some people never learn that lesson. I see guys at the drags revving up cold engines all the time. On the dyno we usually have to run a race engine at fast idle for at least 10 minutes before the oil temp needle moves off of the bottom peg. It just takes a long time for the oil to get hot in most engines. On my dry sump engine the oil never gets hot and we keep a heater running inside the tank all the time. There is just too much cooling surface area with a dry sump tank plus all of the lines.