Re: synthetics

[John Graham <jgraham1@erols.com>]

Sargent Schutt wrote:

> John Graham wrote:
>
> > > Why should it matter as long as the weight is appropriate to the outdoor
> > > temperature? That would seem to be the important thing. Regardless, the
> > > detergents in the synth clean out the buildup that has become part of the
> > > motor (after high, 100k + miles), particularly after 140+k miles when I
> > > switched. (currently 167k miles), That's is what I'm after here. More proof
> > > of that phenomenom - I have heard about it, I experienced it; How many more
> > > out there?
> > >
> > Because synthetic oils don't act the same as reg. oil under pressure.
> > A 5W30 synthetic may look like a 5W40 reg. to hot runing engine.
> > You don't need more proof of the phenomenom because it's true.
> > But it's the why. Just how much gunk doe's one let build up in the engine?
> > I my old days before synthetics, I use an engine flush every other oil change.
> > Because you don't want oil pump by pass valve to get stuck.:-(
> >
>
> John,
>
> I don't disagree that running synth is the best thing for a car. But it's only
> best if synth is run from shortly after break-in and forever thereafter.
> Switching over after 140k miles of regular oil use is bad b/c it removes the
> varnish that has formed around many parts. Changing at regular intervals is a
> must. My oil never gets dirty. I change it every 3k miles. Now that I've switched
> back I have near zero consumption again.

Great the dirt  or varnish is on the engine not in the oil.Thats some go oil your
useing. It plugs up things fast.

>
>
> That the synth removes the reg oil varnish means that it is loosening up the
> tolerances in the engine. more play between parts means more wear. That's the
> physics.

Valve gear yes, piston rings and cylinders no.Varnish has never been a good antiwear
additive.

> You would seem to have it that it is better to have play in your
> internal engine parts and run synth oil than it is to have no slop and no
> consumption while using clean regular oil.

That something you made up all on your own.

>
>
> I can't agree with that. I see no logic that would support the argument that a
> loose motor with synth oil consumption is a good thing compared with a tighter
> motor with no oil consumption on reg oil. I'm not arguing the proerties of
> synthetics here, except in as much as I don't believe that a synthetic is good
> enough to make up for the play and looseness it causes by a changeover at high
> miles.
>

If you can't agree with it, then why did you make it up?
Know one has said anything like that.

John
1990 CQ