Why would the cheap oil be towards the low side of the grade number? 20,30,40 all costs the same. Less film strength, additive package, and base stock you bet, but viscosity? Doug
It has more to do with fuel economy and incompetent regulation, like CAFE standards.
And all oils don't cost the same to manufacture.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
