There is all this talk about what the best oil is to use for protection against cold start ups and stuff like that. Most of the engine wear is on cold start up while once you are already driving there is not that much wear. Why don't cars just use electric oil pumps? I have seen ads for it before where you just turn the key and it will oil the entire engine before you actually start the car. Are there any downsides to using an electric oil pump? There must be since that would cure a majority of your engine wear.