In several forms of racing, they preheat the engine oil and coolant so as to preheat the engine and it’s components as well. For many of these applications it is said to be critical to go through this process to insure longevity and performance from the engine. I’ve been around a few of these engines, both in race situations and on the engine dyno, and can tell you that it’s a pain. Regardless of what you have or don’t have to do the actual heating, the whole process just ads to the time, energy, and staff that is required to run a car. Whether it is worth it or not is not what this video is about, but rather what the heating does to the engine itself.
Engines that require preheating often do because the clearances present are so tight as to require heating in order to avoid damage. Sometimes it is just to keep the oil clean and well circulated prior to running.
Regardless of the reason, knowing just how much a component or clearance will change due to heat is interesting and offers a glimpse into why preheating might be done on some combos.
Check it out.