Hi Mike:
Crus'in the forum again. I love the "oil" thread. Of course you are absolutely right. As long as the lubricant meets the requirements set forth by the OEM for the particular application, then there is no reason not to use it.
I never could understand why folks will pay a premium price for a particular lubricant with fancy packaging or unsubstantiated claims when the not so fancy packaged lubricant will do the same job for less (and probabaly a lot less) money.
A good example of that is Shell Rotella T. For years I used Rotella in my big trucks, farm tractors, lawnmowers and every other 4 stroke engine here on the farm. One day, just for kicks and giggles I took a sample of Rotella and the less pricy Mystic JT8 and sent them off for spectroscopic analysis. The burn results were very close, actually, too close to be of consequence. Of course now I use JT8 exclusively with the exception of my standby genset and my motorcycle where the OEM recommends synthetic oil.
Now that the computers are set up and we are back in the house, you will find me around again. It's been a long summer living in the RV.