Interesting thread. I actually didn't know that you could send a sample of your used motor oil and get an analysis done on your engine. It makes sense though, as in my head (for instance) if you had a piston w/bad rings on it, you could detect blow-by on them because there would be evidence left in your oil.. Nice. It's interesting to hear that some Chevy owners are actually going by the oil change % meter on the dash too... because I never have. Its 3,000 - 3,500 miles MAX on my oil changes with Pennzoil 5-30 (its what i've ran in every car/motor i've ever built). But I rarely baby Truck Norris.. I let him stretch his legs and flex muscles quite often.

..good thread.. thanks for sharing!