2005 Yukon XL Denali 6.0 with 234,000 miles.
I'm having an intermittent low oil pressure problem with my vehicle and I'm not sure where the problem is at. Sometimes the oil pressure is good at 40 PSI or so at idle. But sometimes it drops to 5 PSI or so and the low oil pressure warning comes on. When the issue is present, the oil pressure slowly drops when idling until the warning comes on.
The car makes lifter noise when starting from cold for the first few minutes. Sometimes, but not always, it makes a ticking noise while driving at speed. So I'm not inclined to believe that it's a sensor or instrumentation error.
The car has always been run with Mobil 1 or Pennzoil Platinum 5W-30 full synthetic since we bought it with ~165k miles and changed before the OLM reached 0%. Since the issue came up, I added Lucas stabilizer (flame suit on) and it brought the oil pressure up enough to turn off the warning. Shortly after that I added Seafoam, drove around for 100 miles or so, and changed it again. The issue still persists and nothing ugly came out of the sump with the seafoam.
At this point I think my options are either: remove front timing cover and replace oil pump, or remove oil pan and check the pickup screen for debris. Both are labor intensive and speculative at best.
Any insight would be greatly appreciated!
I'm having an intermittent low oil pressure problem with my vehicle and I'm not sure where the problem is at. Sometimes the oil pressure is good at 40 PSI or so at idle. But sometimes it drops to 5 PSI or so and the low oil pressure warning comes on. When the issue is present, the oil pressure slowly drops when idling until the warning comes on.
The car makes lifter noise when starting from cold for the first few minutes. Sometimes, but not always, it makes a ticking noise while driving at speed. So I'm not inclined to believe that it's a sensor or instrumentation error.
The car has always been run with Mobil 1 or Pennzoil Platinum 5W-30 full synthetic since we bought it with ~165k miles and changed before the OLM reached 0%. Since the issue came up, I added Lucas stabilizer (flame suit on) and it brought the oil pressure up enough to turn off the warning. Shortly after that I added Seafoam, drove around for 100 miles or so, and changed it again. The issue still persists and nothing ugly came out of the sump with the seafoam.
At this point I think my options are either: remove front timing cover and replace oil pump, or remove oil pan and check the pickup screen for debris. Both are labor intensive and speculative at best.
Any insight would be greatly appreciated!