Best Commercial Engine Oil ???

I swear by Delvac.

That being said lots of guys use Delo. They used Delo in the engines of the cement mixers where I worked as well.

I can't think of any application that worked an engine harder than those mixers.

They also used it in the haul trucks for the quarry.

 

So long as it meets the specs and designations required by the engine manufacturer I wouldn't waste much energy and time worrying about it.

 

Given that the mass marketed oils all pass the same standards, I doubt there's any significant difference aside from cost to pay for their marketing.

 

If I could put mobil 1 on my pancakes I would lol.

 

What's stopping you?

 

My wife lol.

 

All 3 are good lubricants, my 7.3 has Delo in it and runs loaded alot, my Sterling seemed to produce an odd smell running Delo but doesn't with Rotella that's in it.

 

read the owners manual.

motor oil recommendations and very often brand name are in that golden bible.

 

You need to check out "Bob is the oil guy" website, if you're going to get serious about this. Tons of info, thousands of posted analysis samples. Those guys have motor oil in their veins.

Or you could ignore that website, and just run Delvac. It's hard to beat. That being said, there really isn't a "bad" motor oil these days. Even the cheap stuff is good.