Change only the oil filter?

> How about just changing the filter at 3k? The oil cost more than the
> filter. If the oil is not worn out but just dirty, would changing just
> the filter make sense? Adding new oil lost from the filter would also
> refresh the additives.

.... and assorted replies, some nice, some nasty.

Didn't we all argue about this a year or so ago?
Filter only - dirt and contaminates still in oil.
Oil only - dirty oil in filter recontaminates new on startup.
Reuse filter - half plugged already, will start bypassing real soon.
It's all coming back to me now.
Time for some Prozac. Aaaaahhhhhh....... much better.

On Wed, 12 Jan 2005, MasterBlaster wrote:

> > How about just changing the filter at 3k?

> ... and assorted replies, some nice, some nasty.
> Didn't we all argue about this a year or so ago?

Of course. We also did Fram vs. not-Fram, K&N vs. not-K&N, Amsoil, Daytime
Running Lights, blue headlight bulbs, Splitfire spark plugs and all the
other neverending threads.

Odds are pretty good we're gonna do 'em all again this year. And next
year, too.

On Tue, 11 Jan 2005 23:36:11 -0500, "jjjsan"
> wrote:

>u can just change out filter only, but get ready to pay to get a new engine
>in awhile, find out how much that is!


I would like to see proof of this.

For example, one of the Amsoil synthetic recommendations is 15,000
miles on the oil change and a filter change at 7,500 miles.

"get ready to get a new engine"...how many miles are we talking about
here?? I know a gent that has an Audi and he changes the oil every
10,000 miles (using synthetic oil) and a filter change at 5,000 miles.
He just went over 150,000 miles on his car. So, should he expect to
be getting a new engine soon??

Mobil announced today several new extended drain interval oils with
performance guarantees.......Mobil Clean 5000 (5,000 mile ODI or 6
months), Mobil Clean 7500 (7,500 miles ODI or 6 months)and Mobil 1
Extended performance (15,000 mile ODI or 1 year, guaranteed).

Sorry Jiffy Lube, but the 3,000 mile oil and filter change should soon
be a thing of the past.

On Wed, 12 Jan 2005, Curtis Newton wrote:

> For example, one of the Amsoil synthetic recommendations is

aWHOOOOga! aWHOOOga!

Scamsoil bull**** alert! Do not proceed in this thread without full
protective gear!

On Wed, 12 Jan 2005 11:41:53 -0700, Curtis Newton
> wrote:

>On Tue, 11 Jan 2005 23:36:11 -0500, "jjjsan"
> wrote:
>
>>u can just change out filter only, but get ready to pay to get a new engine
>>in awhile, find out how much that is!
>
>
>I would like to see proof of this.

The problem isn't so much with the long-chain oil molecules breaking
down over time, although they will do this, but I can't say about
synthetic, never used the stuff.

The problem is with the oil becoming contaminated with chemicals and
abrasives, byproducts of raw fuel at startup and combustion.

If there was a way to filter out the chemicals and contaminants, maybe
that oil could be used for as long as advertised, but some engines are
harder on the oil than others, because of increased mechanical
tolerances. IOW, piston blow-by.

As long as you have a *nice* carbon deposit on your rings, this is
minimized, but as soon as you switch to synthetic, expect that
carbonization to begin to dissolve, and you might see your fuel
consumption and oil contamination go up steeply, as your compression
goes down.

Same goes for the valves, if they are only being sealed on a
high-mileage engine because of carbon deposits that have built up over
time in an engine running non-synthetic motor oil.

>For example, one of the Amsoil synthetic recommendations is 15,000
>miles on the oil change and a filter change at 7,500 miles.

Any synthetic should be able to do that with no trouble. Problem is,
see above.

>"get ready to get a new engine"...how many miles are we talking about
>here?? I know a gent that has an Audi and he changes the oil every
>10,000 miles (using synthetic oil) and a filter change at 5,000 miles.
>He just went over 150,000 miles on his car. So, should he expect to
>be getting a new engine soon??

No, but see above about piston and valve blow-by.

>Mobil announced today several new extended drain interval oils with
>performance guarantees.......Mobil Clean 5000 (5,000 mile ODI or 6
>months), Mobil Clean 7500 (7,500 miles ODI or 6 months)and Mobil 1
>Extended performance (15,000 mile ODI or 1 year, guaranteed).

Fine if you have a new low-mileage car with relatively tight
tolerances on the engine. I am right at the point, 11,000 to 15,000
miles on my engine where I have the *window* of opportunity to switch
to synthetic. I'm thinking about it.

>Sorry Jiffy Lube, but the 3,000 mile oil and filter change should soon
>be a thing of the past.

I think the major good reason to change your oil often isn't so much
that the lubrication characteristics of the oil have broken down, it
is to clean out the contaminants in the oil that the mechanical oil
filter has no effect on, both chemical and mechanical.

Lg

On Wed, 12 Jan 2005 14:01:26 -0500, "Daniel J. Stern"
> wrote:

>On Wed, 12 Jan 2005, Curtis Newton wrote:
>
>> For example, one of the Amsoil synthetic recommendations is
>
>aWHOOOOga! aWHOOOga!
>
>Scamsoil bull**** alert! Do not proceed in this thread without full
>protective gear!


Hah, good one.

For the record, I don't use Amsoil (I use Mobil 1 in my wife's V6
RX330 and German Castrol 0W30 in my V6 A4), but I don't think it is a
bad oil.

The test at http://neptune.spacebears.com/cars/s.../oil-life.html
certainly suggests Amsoil (and Mobil 1) aren't bad oils and can
certainly go well beyond the "3,000 mile" myth.

The marketing scheme of Amsoil, however, certainly lacks a lot to be
desired.

Would recommend you to change both. A changed filter couldn't remove the
residues of combustion from this engine oil.

--
www.omnibusclub.de

"Lawrence Glickman" > wrote in message
...
>
> Please see Central Casting to apply for the job of Gomer Pile,
> U.S.M.C.
>

[SNIP]

Even Gomer Pyle changed his oil! ;-)

We can settle this.

The bottom line is that it's your engine. Apply all your theories all you
want. Knock yourself out. Good luck! Let us know how it works out in a
couple of years.

On Wed, 12 Jan 2005 18:33:43 -0500, "James C. Reeves"
> wrote:

>
>"Lawrence Glickman" > wrote in message
.. .
>>
>> Please see Central Casting to apply for the job of Gomer Pile,
>> U.S.M.C.
>>
>
>[SNIP]
>
>Even Gomer Pyle changed his oil! ;-)

My apologies to Gomer ( Jim Neighbors? ) who, BTW, has a fantastic
house on Maui, down near Hanna 7 pools. With his own airstrip.

Evidently being a dumbass on TV is quite a lucrative job !!!

Lg