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- Path: sparky!uunet!olivea!gossip.pyramid.com!pyramid!daemon
- From: pshyvers@pyrnova.mis.pyramid.com (Peter Shyvers)
- Newsgroups: rec.autos.tech
- Subject: Re: Dirty oil after change?
- Message-ID: <183430@pyramid.pyramid.com>
- Date: 8 Sep 92 16:31:53 GMT
- Sender: news@pyramid.pyramid.com
- Reply-To: pshyvers@pyrnova.pyramid.com (Peter Shyvers)
- Organization: Pyramid Technology Corp., Mountain View, CA
- Lines: 30
- Originator: daemon@sword.eng.pyramid.com
-
- In article <1992Sep7.173024.14772@informix.com> neilw@informix.com (Neil Williams) writes:
- >My SO recently had her oil changed at a local gas station. When I went
- >with her to pick up her car, I took a look at the dipstick.
- >
- >I was very surprised to see that the oil still looked pretty dirty.
- >I've never checked her oil immediately after a change before
- ...
- >
- >Questioning the mechanic, he said something to the effect that you
- >can never get out all the old oil and it mixes with the new to make
- >it look dirty. I didn't buy his story, and suspect we were charged
- >for service not performed, or they didn't change the filter.
- >
- >Is the mechanic correct, or am I right to be suspicious? Oh, previously
- >the oil hadn't been changed for about 5k miles.
- >
- The mechanic is right. If the old oil is visibly dirty, the new oil will be
- dirtied as soon as the mechanic runs the engine to test the oil filter gasket
- for leakage.
-
- Remember, that oil clings to every part in the engine, and the sump won't
- "wash" clean *all* the miniscule sediments that accumulate there when the
- oil plug is pulled. There's also deposits everywhere in the engine.
-
- What I did on my '69 Firebird when I first bought it (used) was run a 50-50
- mixture of kerosene and 30W for about a minute, and then immediately drained
- the crankcase. The engine oil thereafter was whistle-clean, and I never had
- oil-burning in the next 7 years that I had it...
-
- I wouldn't try this on a more modern car though.
-