[calflan]

OK, going out on a limb here, but what the heck right ?

Read the 'Anyone else here take delivery of a V6' in the same forum topic as this topic. Guys there talking about a whistle from the engine compartment.

Tonight I changed the oil on my car and heard the whistle on shutdown. I had the engine cover off and thought I could trace it somewhat to a valve that looks like a PCV valve mounted on top of the intake manifold. The valve was clicking, like an old style PCV valve - it slides up and down, UP allowing airflow past it and DOWN (acting like a check valve) sealing it when no vacuum is present at engine shutdown.
If this is correct and my guess is right and these valves serve the same purpose as predecessor Chevy engines, they provide a positive ventilation for the oil system. I had a '71 V8 Chevy 307 that had a problem with this system. There are PCV valves mounted on the engine valve covers which provide the oil system and oil pan ventilation. Mine clogged, the oil system overpressurized and blew out my oil pan front seal. No real damage, but had to replace the seal - which can be a pain in the rear. Anyway, if the valve I refer to serves the same purpose on the new V6 intake, yours may be stuck closed and allowing the system to overpressurize, giving a high Oil Pressure reading. I can't imagine this valve talks to the engine diagnostics, since there are no wire leads from it, only a single vacuum line, so diagnostics (and subsequently On Star) may not see this problem.

The old style PVC valves were very simple to replace. They just plugged into a rubber seal/grommet on the valve cover. If this is the same design, it may be as easy as replacing that little valve on your car. I started to remove mine tonight just to see, but got some resistance from the insert, so thought perhaps it was not the same ole design. Left it alone. Might be worth checking with a Chevy dealer - any dealer that knows the new Camaro V6 - and ask if this theory holds any water. If so, may be as simple as replacing that valve - all of 2 minutes work.

There are several guys on the other topic that are experiencing the 'whistle', including me. Perhaps there is a batch of restrictive PVC valves and you guys are seeing the first set of associated problems - high Oil Pressure.

Good luck.