When I was a po' college student I used a couple of the STP brand India-made filters. I noticed that if I let one go an inch past 3000 miles, I'd be pulling it out in two pieces.

These were the Autozone filter.. by the way, I looked at a Purolator or some other brand filter in Advance once, and it had "MANN" stamped on it. Checked again a few months later, and it was an india special.

Just wondering, but did you buy the filters at a local store?

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'82 300SD 351k