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Old 05-31-2012, 12:52 PM   #57
Scraping Paint
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Originally Posted by manyboats View Post
...but I've never run anything that was rated as a 5W lubricant.
Well, you'd love the oil that's required in our new Subaru Forester. Synthetic 0-20 weight. Have no idea how one derives a zero weight oil but they did. And, according to the paperwork, not using this oil in the engine voids the warranty. They do make an exception--- in case of an "emergency" non-synthetic oil can be used but only long enough to get the vehicle to where the oil can be changed to the required 0-20 weight synthetic.

I asked the dealer's shop manager why such super-light oil and he said it's because of the very tight tolerances in the engine and the fact that the newest version of Subaru's horizontally opposed four cylinder engine uses a timing chain instead of a timing belt. Have no idea if this is valid info or not, but that's what I was told.

Put 0-20 synthetic in a Lehman with a few thousand hours on it and I bet you'd hear noises that you never knew an engine could make
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