I run STIHL HP Ultra at 40:1 in my 50:1 saws (due to premium fuel having ethanol in it), and 30:1 in my 40:1 saws, works great and they don't burn up if something goes slightly wrong and they're running lean.
Bar oil is STIHL Summer (orange bottle), stuff is super tacky and the oiler can be turned down vs. thinner stuff, plus the bars don't burr nearly as fast, so I'm saving money. Next gallon will be Ultra because it's only +$2 gallon and I finally am able to afford to buy/run high-end equipment.
On the older low-end equipment it's probably better to run the bix-box oil if the pump can't pump the thick STIHL oil, OR the chain speed is low. Low chain speed and tacky oil causes chips to clog the saw because the chips aren't thrown free. There's nothing wrong with using budget equipment, it sure doesn't want to walk on its own when you're not looking, it's just it likes being in the wood much, much longer than a high-dollar saw.