Reconstituted hydrated reverse osmosis opossum rump fat treated with mystical unicorn farts is an awesome lube.
Engine oil suits me.. but, hey I've been a truck mechanic for 30 years and counting... oils, lubes and greases are right up my alley.....so just my thoughts....
until these magical gun oils can withstand a million miles in a 550 Cummins or a 600 Caterpillar, lugging 80,000 to 120,000 pounds of logs, coal, dirt/gravel, tampons or what ever through the mountains, one would be hard pressed to find a harsher environment for lubrication than in an internal combustion engine. I've seen exhaust manifolds and turbos glow, not many weapons will ever get glowing hot and live, yet these engines/turbos can do it on a regular basis. Figure a truck turbo is spinning in excess of 75,000 rpm when under load and can see temps in excess of 1,300 degrees, it's everyday, every haul, day in, day out, and engine oil lubes it. Not to mention it deals with the acids produced from combustion, the detergents to keep it clean and extreme pressure additives, and anti-corrosion inhibitors, just think, how much water vapor an engine sucks in on a rainy or foggy day/night, yet they still don't rust up internally.
I figure if Delo 400 or Rotella is good enough for a $25,000+ heavy truck engine overhaul that will last another million+ miles, then it should be good enough for a $250 SKS.