[v40bart]

Originally Posted by Daim

Nope. Oil takes a lot longer to get up to temperature compared to the water. Oil isn't warmed by the block, but by the friction it "reduces". The oil is pumped into the oil channels and into bearings. These heat it, but not loads at once. Oil can be "lightly warm" when the engine is up to operating temperature (by the water). Being more dense than water, makes it harder to heat as well.

Ever done an oil change on an engine which has been idling itself up to water temperature? The oil isn't really warm at all. Just a little more liquidy than cold.

I'm sorry Daim but you must have been sleeping during your physics lessons. Water is a lot denser then oil and has the highest specific heat of all fluids meaning that it takes more energy to raise it's temperature by one degree then it takes to heat the same amount of oil. The proof of density difference is in oil floating on top of water. The only difference is the areas of the engine that those fluids contact and their boiling point. oil heats up quicker but withstands higher temperatures and has better lubricating qualities.