After reading many UOAs, watching video tests of, and trying the cheapest of oils you can get now, SuperTech (Walmart), Kirkland (Costco), and Amazon Basics, they all seem to be really great performing synthetics. The Kirkland 5w-30 syn at Costco today was $15/5qt jug!
We these being the bargain basement, I was thinking what oils would I actually avoid these days? Other than intentionally using the WRONG oil for an application, it seems you really can't go wrong. In the past there were known oils with waxes that sludged up engines (old Quaker State) or caused seal problems, but today are we living in a golden era of motor oils?