Quote:
Originally Posted by 77cruiser
That's not good for anything, better to not touch it if not driving it.
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That's right. What you'll find is that the oil collects moisture. When you run the engine hard enough, the oil heats to the point of burning this moisture out - which is a good thing. Running the engine at idle does not get the oil hot enough. You need to get it up to driving temperature.
Otherwise, you're just circulating this frothy mess around your engine, which can cause some real harm.
When I researched this before, I was able to find pictures of the inside of an engine which had been treated this way. They were a real eye-opener.