OE filters typical catch debris around 30 microns.
On newer engines the piston ring design is such they break in during cold testing.
I assume why GM did not detect problems with cold testing/Spintron is differences in bearing clearances were/are probably masked by the variable displacement oil pump that keeps the pressure pretty constant based on a spring and oil pressure feedback design. So differences in oil pressure would not easily be flagged as a problem.
I found documents that indicated for some reason GM moved the 6.2l and maybe other crankshaft manufacturing to Mexico at some point, my guess is this may have changed recently.
In addition to cold testing/Spintron testing of the engines after assembly the complete vehicle goes to a treadmill test at the end of assembly for about a 2-3 mile running test, this is the first time the engine actually gets warm.
Back to the question about when to change the oil. I would personally change the oil and filter at 500 miles, then 2000 miles, then 2500 miles. I would then change the oil around the 50% OLM on the dash or at around 4000 miles. Can you go longer, sure, is oil cheaper than steel, yes.
Over 120k miles if you change the oil and filter 2x more frequent than the OLM suggests, you probably spend between $1200-$1500 depending on oil and if you DIY. You CANNOT perform a SINGLE internal engine repair for this amount of money.
I would run 0W40 and no 0W20 oil.
On newer engines the piston ring design is such they break in during cold testing.
I assume why GM did not detect problems with cold testing/Spintron is differences in bearing clearances were/are probably masked by the variable displacement oil pump that keeps the pressure pretty constant based on a spring and oil pressure feedback design. So differences in oil pressure would not easily be flagged as a problem.
I found documents that indicated for some reason GM moved the 6.2l and maybe other crankshaft manufacturing to Mexico at some point, my guess is this may have changed recently.
In addition to cold testing/Spintron testing of the engines after assembly the complete vehicle goes to a treadmill test at the end of assembly for about a 2-3 mile running test, this is the first time the engine actually gets warm.
Back to the question about when to change the oil. I would personally change the oil and filter at 500 miles, then 2000 miles, then 2500 miles. I would then change the oil around the 50% OLM on the dash or at around 4000 miles. Can you go longer, sure, is oil cheaper than steel, yes.
Over 120k miles if you change the oil and filter 2x more frequent than the OLM suggests, you probably spend between $1200-$1500 depending on oil and if you DIY. You CANNOT perform a SINGLE internal engine repair for this amount of money.
I would run 0W40 and no 0W20 oil.
