for the guys that are into recreational oil changing...

"C. E. White" wrote:

> >> BTW, changing your air filter too often is actually
> >> a bad
> >> idea.
> >
> > Good post, IMHO, but I'm curious why you say this? <NB - a straight
> > question, not challenging you - always happy to learn something new>
>
> Read these references and decide for yourself -
>
> http://www.filtercouncil.org/techdata/tsbs/89-3R3.html
> http://www.tomorrowstechnician.com/A...f ilters.aspx
> http://www.donaldson.com/en/filterme...ary/052024.pdf
> - go to page 10 or so



Your information is obsolete.

Here is what the Donaldson article says on page 10.

****[quote]*****


The use of nanofiber filter media in engine air filters
can solve the problems of overservicing and can provide
the customer a filter which works well (i.e., is satisfactorily
efficient at removing particles greater than 1 micron) when new.
The nanofiber layer acts to improve initial efficiency as a
surrogate for a dust cake. The low additional pressure
drop of the nanofiber layer does little to impair engine
power or fuel economy. A nanofiber filter works as a customer
intuitively expects: it provides full protection with
maximum engine performance when new.

****[end quote]******

That article is an advertisement for Donaldson filters with "nanofiber"
technology. That is a advertising buzzword that is intended to convey
the idea that Donaldson filters provide the maximum dirt trapping
capability when they are brand new. Other filter manufacturers make the
same claim. They all say their filters are new and improved and
therefore will trap dirt just as good or better than a dirty filter
right out of the box.

-jim

On Thu, 22 Apr 2010 07:25:13 -0400, "C. E. White"
> wrote:

>
>"Tony Harding" > wrote in message
...
>
>>> Dusty conditions - how many people actually operate their vehicles
>>> in
>>> dusty conditions more than very occasionally? The engines of modern
>>> cars
>>> are sealed much more thoroughly than cars from the middle of the
>>> last
>>> century. Assuming everything is in good order, the main entry point
>>> of
>>> dirt into your engine is through the air cleaner. So make sure you
>>> have
>>> a good air cleaner and stay out of volcanic ash and I think you
>>> don't
>>> need to worry about dusty conditions. Let the looks of your air
>>> filter
>>> be your guide. BTW, changing your air filter too often is actually
>>> a bad
>>> idea.
>>
>> Good post, IMHO, but I'm curious why you say this? <NB - a straight
>> question, not challenging you - always happy to learn something new>
>
>Read these references and decide for yourself -
>
>http://www.filtercouncil.org/techdata/tsbs/89-3R3.html
>http://www.tomorrowstechnician.com/A...f ilters.aspx
>http://www.donaldson.com/en/filterme...ary/052024.pdf
> - go to page 10 or so
>
As far as using K&Ns,

Well, not sayingthe filter is better or worse than OEM filters, but I
used K&N replacement filters (not the "universal" or "cone" type on
both Aerostars and the '88 New Yorker and my daughter's Neon and the
engines went over 240,000km with no wear issues. I used standard
factory type(ac delco, Fram, and Napa) filters on my Pontiac 3.8 and
it blew with 98,000km on it.
Virtually the same driving conditions and maintenance otherwise.

On 04/21/10 01:34, Tony Harding wrote:
> On 03/31/10 08:33, Mark wrote:
>> If there are other pools of oil in the engine, why doesn't the oil
>> turn dark right away? What is the percentage difference between 5%
>> old oil left and 1%? Think it's 4%?
>
> Of what? 4% is indeed 5% - 4%; however, 5% = 1% * 5 as well.

Oops! I *meant*:

Of what? 4% is indeed 5% - 1%; however, 5% = 1% * 5 as well.