Found this TSB related to cold temp's, but tells me there is a new pick-up available. I would either put a gauge on to ck pressure or at least a new sender unit(they go bad alot) SUBJECT:
Low Engine Oil Pressure At Start Up In Temperatures below Freezing
OVERVIEW:
This bulletin involves replacing the engine oil pump pick up tube.
MODELS:
2003 (DR) Ram Truck
NOTE: This Bulletin Applies To Vehicles Equipped With 5.7L Engines.
SYMPTOM/CONDITION:
Some customers may intermittently experience an oil pressure gauge indicating
low oil pressure at start up in below freezing temperatures.
DIAGNOSIS:
If customers indicate that the condition is present, perform the Repair Procedure.
PARTS REQUIRED:
Qty. Part No. Description
1 53021522AD Oil Pump Pick Up Tube
SPECIAL TOOLS/EQUIPMENT REQUIRED:
8534 Engine Support Tool
REPAIR PROCEDURE:
1. Using the procedures outlined in the 2003 Ram Truck Service Manual, publication number
81-370-03059, section 9 page 218, Remove thew engine oil pump and pick up tube.
2. Check the oil pressure relief valve for any irregularities that could cause
the valve to stick open. Repair as necessary
3. Install the new pick up tube, p/n 53021522AD.
POLICY