From: C. E. White on 29 Mar 2007 08:28
<HLS(a)nospam.nix> wrote in message
> "SMS" <scharf.steven(a)geemail.com> wrote in message
>> jwardl wrote:
>> > How can oil be changed TOO often? Personally, think I'll stick
>> > with
>> There is some point at which changing it more often has absolutely
>> benefit at all in terms of engine wear. It's not 500 miles, 1000
>> or even 3000 miles. It's probably somewhere around 7000-8000, but
>> to be
>> absolutely safe, many people change it at 5000. 3000 is an absolute
>> waste of money, no study has shown any benefit to such frequent oil
> You are repeating yourself. Show me data from a reliable source.
> Data, not
Do you have any data that proves 3000 oil changes reduce maintenance
costs? The old Consumer Reports study is about the only readily
available data I can post. There are numerous of SAE papers on the
subject that support the idea that longer oil drain periods are
acceptable. 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....
From: Brent P on 29 Mar 2007 08:37
In article <1175171148_8125(a)sp6iad.superfeed.net>, jim wrote:
> Brent P wrote:
>> In article <5e7m03h7jbpfh502qbt6nepp7ic8rsh94e(a)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,
>> 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.
Thanks mr. usenet nit-pick. I think everyone knows what was meant and how
a thermostat works, I didn't feel the need to write an entire paragraph
about it and go into a HS calculus lesson on limits either.
From: Eeyore on 29 Mar 2007 08:42
clare, at, snyder.on.ca wrote:
> tetraethylleadREMOVETHIS(a)yahoo.com (Brent P) wrote:
> >Steve Barker wrote:
> >> Yeah, and why do they say this? 'Cause the government tells them to. Its
> >> an EPA thing, not the fact that the engine still needs the oil changed every
> >> 3000 miles.
> >3000 miles made sense long ago. but with modern fuel and oil and better
> >internal tolerances it's obsolete.
> Tell that to someone who's had their engine coke up - like the
> infamous Mopar V6
Does such a thing still exist ?
From: Eeyore on 29 Mar 2007 08:44
Steve Barker wrote:
> I run it year 'round in Kansas. Still no problems. There's just not that
> much difference, except the 30w lubes better hot.
On what basis do you make that statement ? Ester based synthetics 'lube' far
better than any dino oil.
From: Eeyore on 29 Mar 2007 08:46
Steve Barker wrote:
> I didn't learn the 3,000 mile thing from anyone but the old man
That figures (with an emphasis on the old).
So what change interval do you recommend for vehicles that use synthetic oil ?