What he is saying is nothing more then any other intelligent person would say. Use the oil recommended by the manufacturer.
AS much as we BITOG people dont want to believe it, there is no intelligent response otherwise.
With that said, we all KNOW that going up a grade lets say to a 5w30 and/or possibly down a grade to a 5w20 is perfectly sound thinking depending on outdoor temperatures and the environment the vehicle is operated in. More or less the oil weight is based on an average temperature and just because the manufacturers have done away with those magical charts in the owners manual that used to allow you to select oil based on grade have disappeared doesnt change the fact that is is still a valid way to choose oil. In todays world, not giving you that choice I is more based on EPA and MPG.
Either way, for over 90% of Americans, if you change your oil on time, the engine will outlast the usefulness of the vehicle.