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Date:         Wed, 21 Aug 2002 11:31:50 +0100
Reply-To:     Clive Smith <clive.harman-smith@NTLWORLD.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Clive Smith <clive.harman-smith@NTLWORLD.COM>
Subject:      Re: Oil Weight Reccomendation
Content-Type: text/plain; charset="iso-8859-1"

> But that doesn't explain why 10-30W is not good for it. Although the hp > output of the mower may exceed that of my van....... :-)

HP isn't the criterion, its the internal design of the bearing, engine lube pressure, materials, clearances and nominal oil and peak component temperatures (no doubt amongst others)

10-30W could be far too low viscosity under cold conditions. And the XX-YYW classification system doesn't inply that the viscosity is higher at hot temps, just that it lubrication properties 'simulate' that of a a YY straight oil at the upper temps and XX when cold. Think of the origins of the classification system - a large body of knowledge about straight oils and little if any about multi-weight oils.

Engineering can be a very grey matter (!), whereas arithmetic is (usually) quite black and white - but not always.

Would we be able to compare a British Hi Fi at 25 Watts/channel with a US spec of something like 100 Watts, just take most things with a pinch of salt, and always try and compare like with like (they're about the same!). Another tip is to trust that design engineers know a little bit more about what they've designed than they are usually given credit for, especially when it comes to Vanagons!

Clive '88 Syncro

----- Original Message ----- From: "John Brush" <jbrush@AROS.NET> To: <vanagon@GERRY.VANAGON.COM> Sent: Wednesday, August 21, 2002 6:15 AM Subject: Re: Oil Weight Reccomendation

> >>I am ignorant of why straight weight even exists anymore. (and on a lot > >>of > >>other topics as well) > > >30 weight is what the manufacturers of my lawn mowers recommend. > > But that doesn't explain why 10-30W is not good for it. Although the hp > output of the mower may exceed that of my van....... :-) > > > John >


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