Fwd: Re: [Vwdiesel] about that oil - again

[Sandy Cameron]

QUESTION
Are wide spreads in synth oils done the same way? (with long chain aditives)

I'm using a 5w50 synth in cold weather, and it seams to perform better for
starts, and I never get the "buzzer" as I do occasionally from the 15w40 I
use the rest of the year.

That happens when I'm towing the trailer with a snowmobile on it at speeds
just around 2000rpm, a casual 40 mph.

The engine just seems to run better with the synth, and smoother.

Sandy


At 06:28 AM 3/2/02 -0800, you wrote:
>Viscosity improvers aren't good lubricators.  They replace oil molecules
and are
>used to attain the "viscosity spread" in a multi-viscosity oil, so a "big
>spread" oil like 10w40 (one of the worst offenders) has more viscosity
improving
>molecules and less lubricating molecules than a 15w40 oil.   There are good
>additives as well...things like anti-oxidants, anti-wear agents (zinc), soot
>dispersants, and base number improvers.
>
>-Dana-