Should we be using lighter weight oil?

R Mangas porter_dog at
Tue Dec 31 01:07:53 EST 2002

  That's a great question.  Part of the answer lies in marketing I think-
there are some posts on the oil board at indicating
that M1 15w50 could be labled with a lower winter number by virtue of its
actual cold viscosity but isn't.


>From: "Dave K." <desmo888 at>
>To: George Harris <harchris at>,
>Greg.Roa at Cinergy.COM,quattro at
>Subject: Re: Should we be using lighter weight oil?
>Date: Mon, 30 Dec 2002 20:28:08 -0500
>What I can't understand is why a synthetic oil of the same viscosity flows
>more easily than a dino oil of the same viscosity at any given temperature.
>Viscosity IS flow, so what gives?
>Dave K.
>'90 CQ
>----- Original Message -----
>From: "George Harris" <harchris at>
>To: <Greg.Roa at Cinergy.COM>; <quattro at>
>Sent: Monday, December 30, 2002 7:43 PM
>Subject: RE: Should we be using lighter weight oil?
> > > That says it all for me.  I like numbers as much as the next engineer,
> > > a 5w rating doesn't mean much to me if my engine can't pump it in the
> >
> > Aren't you comparing Apples (regular oil) and Oranges (synthetic)? Now
> > try comparing the flow of 0W40 and 15W50 at the same temperature. In my
> > experience any oil, including the 10W50 synthetic that I use, is pretty
> > thin at operating temperatures. I think you want that flowability when
> > you first start the car at 5 deg F.
> >
> > Cheers
> > George

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