Of course it's good oil. Walmart doesn't want to be paying for millions of new engines because they sold inferior oil.I run walmart non-synthetic in my autocross bmw which happened to also have been my daily driver at that time. 200k miles and still won class with no problems here in south texas heat.
They all have to meet certain specs to be sold for the public.
I use Mobil 1 also. Rotella T6 is a good oil also.I love these oil posts! They always turn into a subjective rhubarb! Everyone has their own opinion and there is no changing that. Nissan told me that the Frontier COMES with 5W-30 CONVENTIONAL oil. I changed mine the other day with Mobil One 10W30 (it gets HOT here) and a Supertech 6607 filter. Let the flames begin LOL .
BTW I have insisted on Mobil One since I bought the truck, it just seems to run quieter.