I've found the cheaper oil to be fine for the engine but change it more often new cheap oil is still much better then old expensive oil and regular oil change is the best preventative maintenance that an engine can have.
Also I would never do an oil change without a Molybdenum Disulphide additive, the engine runs noticeably quieter and cooler with it. The MoS2 additives are great in the diffs too, I've also tried the PTFE additives and found them to be a waste of money though.
As for non dex ATF in an automatic gearbox, you're on your own with that but hope it goes well


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