Rather than burying this under an old unrelated post I'd like to start a new post to get feedback from late model Avy owners. I've noticed a consistent reproducible drop in oil pressure in my '12 and '13 Avys (and in my wife's previous '11 Tahoe) equipped with the 5.3 AFM Vortec. We have a lot of recent Black Diamond owners who can provide some good info in this area.
Running Mobil1 5W-30, once the coolant is warmed to 210 F (mid gauge) for about 20 minutes in warm weather, my previous '07 Avy always idled 40 psi (mid gauge) and ran at up to 55 psi at highway speeds....BUT... it appears that mid model '11 and later Avys once fully warmed, idle at about 25 psi/600 rpm and climb to 40 psi/1000 rpm and above and remain around 40 psi at highway speeds. I've even test rode a new late '13 at the dealer's and got the same result. Oil levels are fine and no oil warning light. I'm not too worried because all are over the minimum 10 psi per 1000 rpm rule of thumb for safe oil lubrication.
However; it is a little unsettling to see the oil gauge needle climb faster than the tach coming off an idle. Can't be a bad oil pump or stuck oil pressure regulator or a coincidence .......possibly something as simple as oil cooler placement or more complex like a late model engine rework to address the AFM oil spray/stuck ring problem. No sense taking it to a dealer for evaluation just yet because I don't want them addressing a non problem and this forum is probably the best place to get actual owner feedback on whether these are normal readings for later models.
Now that summer and warm weather is upon us, perhaps other '12 and '13 owners can provide feedback if they've also have oil pressure at around 20-25 psi once warmed at idle?
Running Mobil1 5W-30, once the coolant is warmed to 210 F (mid gauge) for about 20 minutes in warm weather, my previous '07 Avy always idled 40 psi (mid gauge) and ran at up to 55 psi at highway speeds....BUT... it appears that mid model '11 and later Avys once fully warmed, idle at about 25 psi/600 rpm and climb to 40 psi/1000 rpm and above and remain around 40 psi at highway speeds. I've even test rode a new late '13 at the dealer's and got the same result. Oil levels are fine and no oil warning light. I'm not too worried because all are over the minimum 10 psi per 1000 rpm rule of thumb for safe oil lubrication.
However; it is a little unsettling to see the oil gauge needle climb faster than the tach coming off an idle. Can't be a bad oil pump or stuck oil pressure regulator or a coincidence .......possibly something as simple as oil cooler placement or more complex like a late model engine rework to address the AFM oil spray/stuck ring problem. No sense taking it to a dealer for evaluation just yet because I don't want them addressing a non problem and this forum is probably the best place to get actual owner feedback on whether these are normal readings for later models.
Now that summer and warm weather is upon us, perhaps other '12 and '13 owners can provide feedback if they've also have oil pressure at around 20-25 psi once warmed at idle?
?) on the master cylinder.....possibly to tell the mechanic up front in lieu of looking up the glove box RPO code.?
8 psi even on todays engines would and have survived, I posted about a 72 402 that was a new rebuild went from NJ to MN on 18 psi at speed and made it there running 70 mph and when I got there changed the pump and it then and to this day has 60 psi at speed. I understand that AMF has problems but pointing to oil pressure as the fix has no bearing on the subject. I have in the past and now say, If you want to know the true oil pressure use a mechanical gauge and stop relying on an electrical sending unit. another thing that may be giving you these reading could be the bypass on the filter and or the pressure regulator in the pump itself. as a racer in the day I would do mods to control said fluctuations. I'm not trying to anger anyone, just to inform. 
