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From: seifert@ihuxl.UUCP (D.A. Seifert)
Newsgroups: net.auto
Subject: Re: Graphite in Mobil 1 oil
Message-ID: <1396@ihuxl.UUCP>
Date: Thu, 11-Oct-84 20:31:40 EDT
Article-I.D.: ihuxl.1396
Posted: Thu Oct 11 20:31:40 1984
Date-Received: Sat, 13-Oct-84 04:52:05 EDT
References: <244@aesat.UUCP>
Organization: AT&T Bell Labs, Naperville, IL
Lines: 23

> purpose, and whether or not [graphite] is harmful for the engine?

The problem I've heard of with Arco graphite is that it
clogs up the oil passages. Eventually you get parts of the engine
being starved for oil, and...

> Also,  if  synthetic  oils  are  so  wonderful,   why   do   most
> manufacturers   warn  that  they  will  not  stand  behind  their
> warantees if you put synthethic oil into your engine?

Easy. They are VERY conservative.  Petrol-based oil is well-known.
They KNOW how it works, they know how their engines will react to it.
Synthetics are a relative new-comer.  Their properties aren't so
well-known.  They may be better, they may be worse.  Maybe they're
better (than conventional oils) for some engines but worse for others.
They haven't had time to test them sufficiently to trust them.
Sticking with conventional oils is safe, so that's what they do.
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