Maybe not all 6.2's have the bad lifter bore/ bearing wear issues

[Antonm]

the magnetic is there as a proxy so you can tell based on one change to the next.. how much iron is in the oil. i have these one every motor i have. tells you when the product is ready to be sold..

Until the epoxy comes off and clogs the oil pickup tube screen or the magnet gets caught up the rotating assembly after it falls off the epoxy anyway.
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[Hiebs]

My 6.2 Yukon was perfect, until a 1000 mile vacation trip blew it's brains out at 27000 miles, lifters and spun bearing, it sat next 2 a few others at the dealership waiting for motors. Dealership had it for a month, and they used a remanufactured motor, didn't even put a new motor on, now at 37,000 it has had consumption issues, eats 2 quarts every 3000 miles, but gm says it's not a problem!!! What do you expect for $85,000! SMH