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DO you still have the oil??????
If so, strain it through a piece of cheese cloth. We do this when an aircraft engine pops a device called a delta-P for overpressure in a particular fluid circuit. By straining the oil through a cheesecloth, we're able to see if there's actually material suspended in the oil or if the filter is just getting old.
Also, since the filter is simply a paper cartridge, see if it's full of metal as well.
Best of luck on this one.....I hope it was just bubbles glinting in the sun.
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