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Manufacturer recommended oils are based on emission requirements and gas mileage before performance considerations are even factored in.
BMW only has to warranty your engine for 50k miles!
Even using shitty dino oils, your engine will most likely survive well past that with the right additives.
Oil weight is only good for flow under certain weather conditions, meaning if you live in predominantly cold or hot weather, won't be the absolute best, the recommendations are a compromise hence the reason the recommendations change often.
Recommended brands and certifications usually have to do with whether the oil brand bothered to play ball with a particular engine maker
I have taken apart V8s that have had $0.99 oils, changed every 3-5k.miles at over 100k miles looking new with minimal to no cylinder wear.
Frequency of changes is king!
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