Mike, did you mean to say the other way around? Or am I understanding oil
viscosity incorrectly? But I agree with you that when cold 20w-50 has a weight
of 20 and 50 at engine's operating temperature. What I have question about
is the 20 weight when cold. Especially in winter isn't it too thick? I think
you answered the question already.

David

--- Mike Collum <collum@verizon.net> wrote:

> David,
>
> When it's cold the engine "Thinks" it has 20 weight in it and when it
> warms up the engine "Thinks" it has 50 weight in it.
>
> During the winters in northern Maine I use 5w 50.  The engine would
> never turn over, when it's below 0� F, using 20w 50.
>
> Mike
>
>
>
> David Kao wrote:
> > Bob, what is your opinion about dino oil 20w-50 most Vanagon people
> > believe in and kind of insist in using it? They have of course a good
> > point that the owner's manual suggested it.
> >
> > My understanding is the 20W part is bad for the first few miles after a
> > cold start in the morning. That's when the most wear happens to the engine.
> > But the number of 50 in 20w-50 is good for the rising coolant temperature
> > when in bumper to bumper traffic. The Vangon's cooling system is unable
> > to keep the coolant at a constant temperature in slow traffic or in climbing
> > long hills, unlike my Passat which keeps its coolant temperature at a
> > constant at all conditions. I can see the benefit of the 50 viscosity
> > for vanagons. But 20w part is really bad for cold start and first few
> > miles of driving first thing in the morning.
> >
> > What's the solution for this? What's your opinion about this? Or it doesn't
> > matter any way? Thanks a lot.
> >
> > David
> >
> >
> >
> >
> >
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