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From: cb@umcp-cs.UUCP
Newsgroups: net.auto
Subject: Re: Magic Oil Numbers (Re: What does "W" stand for ...)
Message-ID: <1908@umcp-cs.UUCP>
Date: Wed, 17-Aug-83 11:13:04 EDT
Article-I.D.: umcp-cs.1908
Posted: Wed Aug 17 11:13:04 1983
Date-Received: Wed, 17-Aug-83 23:36:34 EDT
References: <2598@rochester.UUCP>
Organization: Univ. of Maryland, Computer Science Dept.
Lines: 18

I have seen the W only on low numbers (that is 10W and 20W; there is no 10).
From 20 on they use it without "W" (i.e. 20, 30, 40, 50; there is no 30W, ...).
As far as I can remember I once read that W stands for "winter"
because those oils are used in winter; oils without "W" would be used in 
summer.
Actually the "W" does not mean anything per se, it just marks the
thinner oils; kind of draws your attention that you shouldn't use
10W in summer.

Anyone who knows better (I may be wrong)?

			Chris
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