The one obvious difference between the 5.3l and 6.2l is they all have the same basic variable displacement oil pump, ALL but the newer L84 5.3l have a 2 stage oil pump that is controlled by a solenoid that is not serviceable, this is why there are different oil pump part numbers for the L84 5.3l, vs the L83 5.3l and the L86/L87 6.2l.
Please understand the variable displacement oil pump is the BASE for the 2 stage oil pump. The only difference on the 2 stage oil pump is the solenoid that boosts the oil pressure somehow. I beleive the default/failed/unplugged state of the 2 stage oil pump is high pressure.
I do not think there is enough known about the AFM/DFM behavior if the oil pressure is constanstly boosted. There would likely be a CEL/MIL/SES triggered as well.
Agree that there may be an oil starvation issue when all the DFM activity is happening.
#1 rod bearing is the absolute last bearing in the lubrication path, just behind the front crank bearing. Seeing probably more of these failures out of most bottem end failures, but there are also problems with the thrust bearing on the center main, have alse seen rod bearings #7  fail as well. Probably a number of different things going on here.
Please understand the variable displacement oil pump is the BASE for the 2 stage oil pump. The only difference on the 2 stage oil pump is the solenoid that boosts the oil pressure somehow. I beleive the default/failed/unplugged state of the 2 stage oil pump is high pressure.
I do not think there is enough known about the AFM/DFM behavior if the oil pressure is constanstly boosted. There would likely be a CEL/MIL/SES triggered as well.
Agree that there may be an oil starvation issue when all the DFM activity is happening.
#1 rod bearing is the absolute last bearing in the lubrication path, just behind the front crank bearing. Seeing probably more of these failures out of most bottem end failures, but there are also problems with the thrust bearing on the center main, have alse seen rod bearings #7  fail as well. Probably a number of different things going on here.
