Correct. The acidity of oil is called Total Base Number (TBN). When fleet
oil/motor tests are done, they monitor this number to keep track of the
oil's condition. They also monitor metal content in the oil.
-----Original Message-----
From: datsunmike [mailto:datsunmike@nyc.rr.com]
Sent: Wednesday, June 26, 2002 6:45 PM
To: ian miller; datsun-roadsters@autox.team.net
Subject: Re: snake oil
Ian,
I have to disagree with your assumption that oil doesn't go bad except for
oil contamination by gasoline.
One of the byproducts of combustion is sulfuric acid and it's the acids that
really ruin the oil. The gas should evaporate from the oil on a long
distance run.
One of the reasons however that new cars seem to burn more oil is that gas
isn't getting into the oil and doesn't raise the level of the oil because of
tight mixture conditions. Moreover, the higher operating temps of modern
engines also burn up some oil.
It was acid that killed the oil :)
Mike
----- Original Message -----
From: "ian miller" <datsun661600@hotmail.com>
To: <datsun-roadsters@autox.team.net>
Sent: Wednesday, June 26, 2002 2:50 PM
Subject: snake oil
> While we are discussin snake oil, what is the concensus on Amsoil? RELAX!
> I"m not running it in my roadster. I've heard some very big motor guys
rave
> about the stuff, so I decided to try it in my Explorer. I figured if I
was
> going to blow a motor it should be in the car I nick named the Exploder.
> The recomended ooil change is every 25000 miles or 12 months with a filter
> change at 12500 or 6 months. A friend I know has a 88 F350 tow trailer
that
> he uses to cart land speed record cars all over the country. He has been
> running amsoil in it since it was new and it now has 350,000 miles on it.
> In may he decided to tear apart the engine, just because he was bored. He
> replaced all the seals but put the bearings back in and claimed they
looked
> nearly brand new. This guy knows motors and he trust the stuff. there
were
> 2 other friends who suggested Amsoil. One is a mechanic for GM Powertrain
> Development. He tears apart the motors they blow up on their dynos. The
> other is a test engineer for Chrysler.
>
> On the other hand...I realize that one of the worst effects of old oil,
has
> nothing to do witht the oil, but the amount of gas that gets in and
changes
> the viscosity. Actually the "oil" will never really go bad. The debris
> from motor wear should be caught by the filter. The only real change is
in
> the viscosity change (gas in the oil) and the detergents go bad, or get
used
> up.
>
> So then what is the difference between Amsoil and Mobile1 or any othe
> quality synthetic? Is it just marketing?
>
> Ian
>
>
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