Used Motorcraft FL-1A oil filter cut open in a vise showing plea…
Stuck ValvesView all 35
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
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