Synthetic oils

I just try different oils and let the gauges tell the story, and when freshening...the bearings/cyl walls.

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The oil temp on my Cummins truck runs about 20 degrees hotter on the same hard pull with the same load, and idle oil pressure is lower, at the same temp on both oils...... Not to mention my change interval is 10K. Amsoil in the pan, it burns about 3 quarts in 10K, the times I had to get it changed and went to smucks at 8PM at night and bought regular dino oil, the oil gets so weak the oil pressure scares me by the time it has 5K on it, and after about 2K, it starts burning about a gallon every 1500 miles, gradually gets worse. (DELO 15W40 gets drank the fastest)

Friction test, double ball scar test, blah blah blah, if you know what you are looking for, your motor will never lie.

(that means Wildman is 100% correct)

And don't even ask what happened when I ran out of Amsoil 10W40 in my little quadsport 230 ice racer and tried to use Castrol 10W40........ LOL