GM's procedure for priming the oil system on a Northstar engine     After completing engine service requiring engine oil pump removal, you must perform the following procedures to prime the lubrication system before start up.     1. Verify that the engine oil is at the proper level. System capacity is 7 quarts with the oil filter full.     2. Fill the oil system to the proper level if necessary.     3. Disconnect the right front connector (Power Lead) from the ignition module.     4. Crank the engine for 30 seconds.     5. Reconnect the power lead to the ignition module.     6. Start the engine.     7. Check the DIC for a Low Oil Pressure message.     8. Listen for any audible engine noise such as lifters ticking.     9. If engine noises persist, stop the engine and remove the oil pressure sensor from the oil filter adapter.     10.Install an oil pressure gauge. Do not damage the threads in the adapter.     11. Start the engine.     ~ If oil pressure is indicated on the gauge and no unusual sounds are heard, oil pressure is present and both the oil pump and the engine lubrication        system are primed.     ~ If no oil pressure is recorded, repeat from step 4 and then proceed the next step.     12. If no oil pressure is recorded after repeating the process, remove the oil filter adapter and force engine oil under pressure (using shop air) in the engine block          outlet port (the port closest to the front of the engine).     13. Reinstall the oil filter adapter.     14. Restart the engine.     15. If oil pressure is obtained, stop the engine.     16. Reinstall the oil pressure sensor in the oil filter adapter.     17. Once the oil pressure sensor is connected, check the instrument display for a no oil pressure or low oil pressure message.     18. If a no oil pressure or low oil pressure message is present, check the switch connection. Repair the switch connection as necessary.