low oil pressure when first started car?

Ok, I'm looking at problems really closely on this 2006 Montana SV6 van right now. We have a warranty that's expiring in a few thousand miles. Our tranny went out so we just got that rebuilt for the $100 deductible a few days ago. Got lucky on that one.

When I started the van to pull it into our garage yesterday, for a few seconds, the DIC displayed "Low Oil Pressure" for a few seconds and went away. The only time I ever see that message is immediately after I change the oil. But the van hasn't had an oil change for about 1500 miles.

Is this something I should get it back into the dealer to fix before the warranty expires? Or is it normal for once in a while to show that message on a start?

I would change the oil filter. I have seen oil filters go bad and cause that. At the same time you can cut open the old filter so see how much debris is in it to see if bearings or such are coming apart. Filters are cheap engines are not.If the dealer wont do it then for the cost of a filter just get it done anyways so you know.

Check the oil level to make sure it is where it should be. Also, what was the temperature when you started the van? If it was cold the oil may be too heavy for the temperature and should be changed to a lighter weight. Finally, I agree that the oil filter may be a problem as it may be partially plugged or the anti-backflow valve may no longer be working.
If all of the above are normal and the issue doesn't resolve itself after the filter change take it to the dealer for a diagnosis.

If you do go into a dealership for a diagnosis, please let me know through a private as I would like to follow up with them (and you) to make sure that everything is taken care of.

Happy Holidays,
Sarah
GM Customer Service

My daddy used to say that oil and filters are the cheapest thing you'll ever put in your engine!
If the oil level and viscosity are correct for your current climate and its been changed recently like you say then the guage pressure switch might be sticking due to the temperature outside.
My '02 Mountaineer used to do that whenever I was traveling in a cold climate.(like in the 30's). Except it would stay on till the engine warmed up! I put a manual guage on it to verify oil pressure was ok at start up. Then changed the guage sender. Problemo adios.

I agree with DeltaP.....remove the sender and attach a mechanical gage to check the pressure.....

I would change the oil filter. I have seen oil filters go bad and cause that. At the same time you can cut open the old filter so see how much debris is in it to see if bearings or such are coming apart. Filters are cheap engines are not.If the dealer wont do it then for the cost of a filter just get it done anyways so you know.

I'd agree with replacing the filter. I had this problem with FRAM and the many "after market" filters they do for other brands (Canadian Tire - MotoMaster being one).

The design flaw is that the back flow preventer built into the filter becomes inadequate after about 500 miles. The back flow is supposed to prevent the filter from draining (horizontal mounting filters typically) back into the oil pan, but the preventer weakens and loses its ability to keep the filter charged with oil between runs.

Result: every start is a cold start similar to draining and filling with new oil and replacing the filter.

I've had better success at NAPA, particularly with WIX filters, and Hastings are good too. Like most things, you get what you pay for, but I think a good filter should still cost about $5.00, no more.