This is a post by the guy I mentioned:Has anyone done a UOA on a known bad engine? I think it would be amusing to see what Blackstone thinks of a UOA from an engine with a hole in the block.
I've mentioned the two very quickly failing engines I've had with sparkly oil that multiple UOAs did not pick up on. Upon teardowns, the rings were half the weight they were when the went in, cylinders were void of hone marks with a large wear ridge at the top, rod and main bearings were down nearly to the backing plates, and I had one cam lobe starting to go flat.
They're great for many other things and I plan on getting one done soon on the TL to check other things but I won't even look at the wear metals.
It's almost comical that people still base oil preference on a few PPM of wear metals with all of the info out there today.
It is not controlled enough to make valid comparisons.Unless the same engine is run under the exact same conditions who really cares if one oil has 10 ppm for iron and another oil has a 20 ppm reading?There could be any number of reasons why the car with the higher reading is higher.Maybe ...
I can’t find his good uoa on a bad engine using google search and he has a lot of posts from back in the day.