Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 exptools 1/6/84; site ihuxa.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxj!houxm!ihnp4!ihuxa!heneghan From: heneghan@ihuxa.UUCP (Joe Heneghan) Newsgroups: net.auto Subject: Multi Viscosity Oil Message-ID: <661@ihuxa.UUCP> Date: Tue, 25-Sep-84 11:53:04 EDT Article-I.D.: ihuxa.661 Posted: Tue Sep 25 11:53:04 1984 Date-Received: Wed, 26-Sep-84 19:52:19 EDT Organization: AT&T Bell Labs, Naperville, IL Lines: 20 Oils can be made many different ways but most are made with two additives, a viscosity index improver and a pourer depresant usually among others. These two tipify additives used for multi-grade. The idea here is that you want the oil to flow under a range of temperatures. Oil behaves like ball bearings- minimize friction. Lawn mowers, boat engines and other special engines can use single grade. Some diesels shouldn't use the multi. But I'd be careful about making a claim against an auto manufacturer when useing single grade oil. You can use a heavy weight in the summer and a light weight in the winter if you want. Let's talk about WWII for a point of reference, correct me if I'm wrong, but a famous battle was won partly due to the fact that the Germans used heavy oil in the middle of winter and... RAAAA-RAAAAA-RAAAAA-RAAAAA, their engines wouldn't start. I would summarize by saying oil is application specific. We can say without reservation that multi-grade oil is user freindly and auto makers seem to like it in their engines.