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40W oil causing wear problems over 30w?
Subject: 40W oil causing wear problems over 30w?
From: Hell, multi weight oils start out at their low number and get more viscous as their temp rises. no they don't. 15W-40 is the same viscosity ("thickness" if you will) at "room temp" as straight 15W oil is, and the same viscousity as 40W at engine operating temperature. 15W-40 is much more viscous at room temp than it is at engine operating temp. If you doubt that pull the dipstick on a warm engine and see. Perhaps I misstated. Multi weights oils, as I understand, when they get hot only thin out to the point that their high weight number would at the same temp. Something about polymers uncoiling into long chains. In other words think of a 15-40W oil as a 15W oil that will not thin more than a 40W would when hot. Like I said, that's my understanding. But, I could be wrong. That's why I asked the question. :-) Capt. Bill |
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