Just asked because the current PF 8 is an 8A which means at some point an 8 had some changes and was upgraded to 8A. Rest of the curiousity is whether Honeywell did it or was done before their acquisition. I do know that Fram now uses a glass fiber impregnated paper which, I learned from another site is there to improve the consistency of cellulose. That may be the difference.
I've been an oil and tire nut all my life; just interesting following along with technology. Probably because my first vehicle was a '47 Chevy truck that I bought with money earned as a deck hand on a tug boat that summer, that had bald tires and heavy duty oil with something added (sawdust was the common slang) to help it not burn oil till it got off the lot. Changed the oil as soon as I got it home as it was diesel black and the cloud of blue smoke it produced afterwards would gag a maggot. Never forgot either.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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