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Be sure to replace the PCV valve when you put it back together, that is the leading cause of oil consumption in these engines.
I always go for the Motorkote, to put on my engines and in my air tools, it bonds to the metal, and is what is considered a hyper lubricant. Could save your engine if you lose oil pressure, might help it last longer too.
I say take that one out replace it with a rebuilt one, and then rebuild the old one yourself, and keep it on hand for when the replacement starts knocking. Then repeat the cycle.
It seems as though this engine just tends to run noisily as it gets wear on it, and compared with other people’s is normal.
Spark plugs are correct and gapped, it has a timing chain and electronic coil over plug ignition. 105000 miles, hydraulic lifters, and I do regular maintainable on it. MAF was cleaned 15000 miles ago. By a mechanical sound I meant it’s a bit like pinging but very light, like a hammering sound that you might expect from an old v8 at full throttle, but only on one cylendar. I did do a compression test a while back and the number 4 cylinder had only 70 psi wet but that may have been an error in my method of measurement. The rest were around 95-100. Previously I replaced the timing chain tensioner which was loose causing the chain to tap against the valve cover due to carbon in the oil passage. For the first 73000 miles it was driven mostly in town by my grandparents, causing a lot of the carbon buildup, but I have cleaned it out pretty good.