lol, u just summed up the entire Internet in 1 postWell, I usually don't respond to oil threads but I will share my two cents:
I use that Amsoil stuff after reading over one million posts by Amsoil fans over the years. If Amsoil synthetic is not available, I'll buy the other big name brands. If I can find an oil that is colored purple or some other cool color, I'll buy that because it must be the best stuff.
I never buy the oil on sale because that means it's stale or near its expiration date. Just think about it. Why else would it be on sale? Would you drink milk after its expiration date? Of course not. I am too smart to fall for that scam. Buy from the store or online vendor with the highest prices. That's the good stuff. If I can pay at least $15 or $20 per quart, then I know it's going be a good oil.
With the Amsoil, like others state on forum threads, all my engine problems went away immediately and I gained around 25HP. Like magic. No ticking or other noises. Sometimes I am not even sure the engine is running its so quiet. I usually have to stick my hand down near the drive belts to feel if they are running. My windshield wipers also improved dramatically. Headlights are brighter too.
I change the oil and filter every 75 miles or 5 days just to be sure I am always getting maximum protection. Why run your beloved vehicle on used up garbage oil? Makes no sense at all. If I can't get it done on the scheduled day, my wife and/or 9 year old child know to change the oil/filter for me, so they can avoid my rage at the thought of running an engine even one day with old useless oil in it.