How can oil drain from the cooler if the thermostat is closed? I'm not being argumentative, I'm intrigued! And, if heating up isn't connected to the cooler, what function does the thermostat have? Graham88 wrote: The point i am making is that the oil cooler and the rest of the engine will empty if its cold or hot, just at a different rate, whether that is relevant or useful is up to whomever, but it is factual nonetheless. The notion that oil is locked away somehow, isn't.
The horizontal part is very important forgive the analogy but if you take the lid off a tin of room temperature treacle and lay it down on its side (or horizontally, or even upside down) it will take a long time to empty but if you heat it up and repeat it will empty a lot quicker. The procedure is the same for an LC model which doesn't have a cooler, which also implies that heating up is not really connected to the cooler.
I was querying your use of 'especially' in respect of horizontally opposed engines. It matters not what the cylinder layout is, surely.....
Pete