CAT 320D E360 low oil pressure at idle

On a CAT 320D, an E360 (2) complaint at hot idle is most consistent with a low engine oil pressure signal/fault. Since the oil level is good, check actual pressure first before chasing sensors.

Start here, in order:

1. Verify oil pressure with a mechanical gauge at hot idle and at rated high idle.
   • This tells you if it’s a real pressure problem or a false electrical/readout issue.
2. Check the oil filter and oil grade.
   • Wrong viscosity, fuel dilution, or a restricted/incorrect filter can show up only after warmup.
3. Inspect the oil pressure switch/sensor and wiring.
   • Heat-related sensor drift, loose connectors, or rubbed wiring often trigger faults at idle first.
4. If pressure is truly low, look at the pickup and pump side.
   • Oil suction leak, plugged pickup screen, worn pump, or relief valve stuck open.
5. If the engine is tired, check bearing wear.
   • Hot idle is where worn mains/rods usually show up first.

If you can, share:

• engine serial number
• oil pressure reading hot at idle
• oil grade/filter part number

I can help narrow it down.
Verify against the CAT service manual before relying on any pressure spec.