Disassembled Motorcraft FL-1A oil filter showing filter element,…

After checking the block passages with shop air, the only thing left to restrict oil flow was the filter. Sure enough, it was utterly blocked by sludge. Even after draining for ~30 minutes, it was still more than half-full because nothing was moving through the filter paper.
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The Great Synthetic Oil Fraud

Owner caption October 2020 · Photo 179 of 202