The point is that it DOESN'T change viscosity!
Peter
On Oct 1, 2006, at 12:55 AM, Zoltan Finks wrote:
I'm not disturbed by that at all, in fact I love it.
How can we be certain though that the oil will behave that way?
Bear with me, I never took chemistry. But when the my engine's health
is in
the balance, this chemical wonder that is an oil switching viscosities
based
on temperature has long made me wonder. I'm not being a smartass, I'm
asking. Is it 100% reliable that my oil will know when to be zero
weight and
know when to be forty weight, and that it will never screw up?
If it is indeed foolproof, then it is only logical to run the 0W-40,
as this
will let the engine turn more freely at very cold temps. and may even
increase fuel economy?
Brian
83 240D
And here I said I wasn't starting an oil thread
On 10/1/06, Gary Hurst <[EMAIL PROTECTED]> wrote:
it's a 40 weight oil when cold that become a zero weight oil when
cold?
do you see something disturbing about this logic?
On 9/30/06, OK Don <[EMAIL PROTECTED]> wrote:
I, too, had shared this concern, until I read somewhere that the
higher number is the "real" viscosity, and the lower number is how
the
oil reacts in cold temperatures. That is, a 0W40 oil is a 40 wt. oil,
that maintains a viscosity similar to a 0 wt. oil at 0 degrees C., or
something like that -- it doesn't get as "thick" as a 40 wt. oil
would
at that temp., it's as "thick" as a 0 wt. oil would be at that temp.
Please correct if I'm wrong ---
On 9/30/06, Peter Frederick <[EMAIL PROTECTED]> wrote:
0 weight oils are too thin, in my humble opinion, for any diesel.
Too
much pressure on the journal on the compression stroke, not enough
film
strength, even for a synthetic like Mobil 1
The difference between dino and synthetics is huge, the difference
in
cold viscosity of synthetics is fairly small.
I believe the 0 weight oils are intended to give small gasoline
engines
a bit better milage from lower oil pump resistance, not something
I'd
like to try in a diesel!
Just my opinion. I tend to use 5W40 or 5W50 Truck and SUV or 15W50
Mobil 1 in the summer and 5W40 in the winter, but if I need to
change
the oil and can only find 15W50 in the winter, I use it.
Hard starts are usually not helped by lower viscosity oil unless you
have fairly high viscosity dino in the crankcase -- I've seen an
engine
that simple would not crank at all in the winter with 50 wt in
there
to hide a bad bearing....
Peter
--
OK Don, KD5NRO
Norman, OK
"The Americans will always do the right thing... after they've
exhausted all the alternatives."
Sir Winston Churchill
'90 300D, '87 300SDL, '81 240D, '78 450SLC, '97 Ply Grand Voyager
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