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From: smh@mhuxl.UUCP (henning)
Newsgroups: net.auto
Subject: Re: Oil changes
Message-ID: <529@mhuxl.UUCP>
Date: Tue, 4-Feb-86 09:04:46 EST
Article-I.D.: mhuxl.529
Posted: Tue Feb  4 09:04:46 1986
Date-Received: Wed, 5-Feb-86 04:41:32 EST
References: <395@ncr-sd.UUCP> <465@tekig5.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 14

> Do you really change oil every 7500 miles? You must place a low value
> on your car. By the time 7500 miles has passed the oil in the crankcase
> is about 1/2 gas and will not provide worthy lubrication. That is why
> diesels need oil changes more often; the high compression forces fuel
> past the rings and dillutes the oil. The same thing happens to a gas
> engine, it just takes a little longer. The need for oil change is not
> because the oil is dirty, just dilluted.

I have noticed that after 5,000 to 6,000 miles on an oil change, that I
am not getting good lubrication to my valves/overhead-cam.  The valve noise
starts getting louder.  I don't see how a manual can recommend 7500 miles
when the oil doesn't last that long.  I am talking about Sears Spectrum
10w-30 in a Volvo 245.  As soon as I change oil/filter, the valve noise
goes away.