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Old 09-10-2008, 02:04 AM
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Grit in my oil filter

I just did a oil change in my 78 malibu and decided to cut open the filter to see how much crap might be floating around in my oil. It's a high mileage 305 so I know it's pretty worn but when I looked in the filter I found allot of black gritty junk that I figure must be carbon. I know what metal fillings means if it's in the oil but why would I have so much of this gritty carbon considering I last changed the oil only 5 months ago?

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Old 09-10-2008, 05:59 AM
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Have you run a fuel system cleaner through it?
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Old 09-10-2008, 09:50 AM
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A high milage engine may consume a lot of oil. Carbon builds up and then when you "step on it" the carbon breaks loose. Most goes out the exhaust, but some gets in the oil. The oil filter then traps it. So far, it's a normal situation.

Note: The bad news is that most oil filters have a bypass valve that opens when the oil is cold and thick, allowing unfiltered oil to get to your bearings. Cars which are only run for short distances suffer most from this.

Anyway, just how large are these gritty particles? Only small particles should get by the rings. I'm not familiar with the systems on a 78 Malibu, but does it have an EGR system? If so, I'd check it out carefully.
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