"Brent P" <tetraethylleadREMOVETHIS@yahoo.com> wrote in message
news:3pOdnSmtV-AQ15bbnZ2dnUVZ_orinZ2d@comcast.com...
In article <35mdnf-ezp432pbbnZ2dnUVZWhednZ2d@giganews.com>, Steve Barker
wrote:
Wrong, just Wrong.

In which universe? Not in this one.

Here's a hint... oil coolers use the coolant to cool the oil.

Wrong again Bret. Transmission coolers use the coolant in the radiator to
cool. All the engine oil coolers I have ever seen were air cooled regardless
of manufacturer.

\A copy of the old CR study is at
http://home.mindspring.com/~ed_white/id9.html . I know it is old and
since they used taxis, they don't have as many cold starts per mile as
a typical Consumer....

So what change interval do you recommend for vehicles that use synthetic
oil ?

Graham

In article <5e7m03h7jbpfh502qbt6nepp7ic8rsh94e@4ax.com>, clare at
snyder.on.ca wrote:

Minimum 20 minutes to get the oil to full operating temperature, and
then about another 10 minutes for every day of short run cold morning,

snip

When your coolant has reached OT and the thermostat is open, the oil has
reached operating temperature some time before that. It's basic heat
transfer. If it had not, the coolant and engine block would still be
warming the oil and the Tstat would remain close.

"John Henderson" <jhenRemoveThis@talk21.com> wrote in message
news:570njeF2bipsiU1@mid.individual.net...
jwardl wrote:

How can oil be changed TOO often? Personally, think I'll stick
with 3/3k.

Because there's more wear with new oil than with moderately
stressed oil.

Got any proof to back up that claim ? I have to call bullshit on that one,
it doesn't even make sense.

If the lab results were different, I'd be changing my oil more
frequently. At some point, you've got to go with the evidence
and leave the fairy stories and wishful thinking behind.

John

----- Original Message -----
From: "Steve Barker" <ichasetrains@some.yahoo.com
Newsgroups:
alt.autos.ford,alt.autos.nissan,alt.autos.toyota,alt.trucks.ford,rec.autos.driving,rec.autos.makers.ford.explorer,rec.autos.tech
Sent: Wednesday, March 28, 2007 10:06 PM
Subject: Re: Automakers Lengthen Oil Change Intervals


I run it year 'round in Kansas. Still no problems. There's just not
that much difference, except the 30w lubes better hot.

Why do you say that? Back in the 70's multi-weight oils got a bad
reputation becasue some of the early 10W40 oils tended to break down
and in some cases you ended up with some sort of goop in the engine.
That was long ago. Modern API certified 5W30 and 10W30 oils have never
had that sort of problem. At normal "high" oil operating temperatures
(around 100 degrees C), straight 30 weight Havoline has a viscosity of
10.3 cSt. while both 5w30 and 10w30 Havoline have a viscosity of 9.7
cSt - less than 6% different (the acceptable range for 30 weight oil
is 9.3 to 12.5 cSt). At 40 degrees C (104 F), the straight 30 weight
has a viscosity over 80 cSt while the 5W30's viscosity is less than 60
cSt (both are still far thicker than either oil at 100 C). During a
normal cold start straight 30 weight oil is much thicker than 5W30
oil - not a good thing. Once an engine is warmed up, the 5W30 and
straight 30 weight have to meet the same viscosity requirements. So
where is the advantage of straight 30 weight oil?

Brent P wrote:

In article <5e7m03h7jbpfh502qbt6nepp7ic8rsh94e@4ax.com>, clare at snyder.on.ca wrote:

Minimum 20 minutes to get the oil to full operating temperature, and
then about another 10 minutes for every day of short run cold morning,

snip

When your coolant has reached OT and the thermostat is open, the oil has
reached operating temperature some time before that. It's basic heat
transfer. If it had not, the coolant and engine block would still be
warming the oil and the Tstat would remain close.

The thermostat does not remain closed until the engine is warmed up it
opens proportionate to the coolant temperature. Ideally it never opens
all the way.