This video doesn’t apply to your car if it has a carburetor or if it burns diesel instead of gasoline
One of the most prolific myths about how to best run a car engine so that you extend its lifespan as much as you can has to do with warming it up after starting. Many say it’s good for a motor to be allowed to idle for a good few minutes after it was spun into life, but as this video tries to illustrate, that might not be such a good idea.
In brief, the video says that it’s actually quite harmful for an engine to be left to idle before setting off as this actually increases internal mechanical strain due to poor lubrication. It argues that, in the case of gasoline-burning, fuel injected engines at least, doing the whole idle for a while thing starves the engine of much needed oil.
It goes on to state that in order to achieve a fuel-air mixture of appropriate richness when cold, a modern, direct-injected engine will pump extra fuel into the cylinder. Gasoline is, as you know, a solvent, so what it’s basically doing is feeding in more fuel which in turn is actually washing away the oil inside the cylinder.
The video is quite compelling, at least with the arguments brought forth here, but the same principles may not apply to older engines (they don’t apply to carburetor engines at all, as those do need to be left to idle; they are actually the source of the myth) or diesel engines which treat the problem of internal lubrication quite differently.