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Sludge!!

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I've got a 2000 9-3 whose oil light has been flickering on and off. It was doing it a lot when the weather was warmer and I was using A/C. It seemed to happen mostly during braking. Now that it's colder it's not happening very much.

I've been meaning to drop the oil pan and clean out the filter but before I take this on, is there anything else that would cause this specific behavior? All the posts I've seen have said it's almost always sludge in the filter down there.

Also, if I end up doing it, is there some way to tell if I've got the most recent PCV repair kit so it doesn't just come right back?
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