2005 Escalade esv
I have a 05 Escalade esv with a 6.0 ltr. 272k miles ,5w30 syn.oil,good filter,idling oil pressure at startup is at or near zero(new sending unit) after warmup it runs 15 psi idling and 45 psi at 2000 rpms. Has anybody out there seen this ? Oil pump ? Pickup tube o ring? Bearing wear ? No rattling or knocking.