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I agree Pothole, no guarantees, but it will certainly tell you if things are seriously amiss at the time of a purchase (and lets face it, haz's car was still running fine when they discovered all of the particles in the filter). So too would a small amount of metallic particles (lets say, anything more than about three very small ones), or to a lesser degree, the presence of plastic particles. One won't always be able to catch a problem before it happens, but your chances of finding a pre-existing one (or with short oil-change intervals, one that is just starting to develop) increase dramatically with an inspection of the filter.
Brad
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