Hi, Ron. I have...
Hi, Ron. I have a 2008 GMC Yukon Denali with 150k miles that has been dealer maintained since purchase, had oil changes at least every 3k miles and all other suggested maintenance done. For the past two weeks, we are getting an "Oil Pressure Low, Stop Engine
Now" light/alarm at startup on most days. It goes away when the engine warms up. Took the car to the dealership and they said it was a switch (sensor?). $750 to replace the switch and change the oil and filter, and they tested the oil pressure while it was in the shop and said it was fine. We have not had any leaks from the car, ever.When I went in to pick up the car, the oil alarm was literally going off as he handed me the keys in the lane. I sent it back to the shop and, a week later, they told me they have only seen this one other time before and it needs a new engine - for $8k. Picked up the car yesterday and the oil pressure alarm was still going off in the lane and, for the first time, the engine sounded a little rough. Not knocking, but not quite right. I drove the car home and watched the oil pressure gauge. It's around 40 at most speeds, but drops pretty quickly at idle (stopped at a light) and then the pressure alarm goes off. Engine doesn't stall. Oil alarm turns off if I put some RPM's on the engine. Seems to stay steady around 40 psi above 1k RPM's.We were planning on selling or trading in the car in the spring but may do so sooner; however, I will not sell a car outright with a potential big issue and now I may not get anything on a trade-in if I have this alarm going off. I've been searching some forums and I think there are some other things to try/ask first:
- ask if the filter right under the sensor is clogged? Unfortunately, mechanic told me the switch was located in a tough spot to change, that's why it took so much labor. I have no idea if he checked the filter (or if I can trust him if he said he did) or can do so easily now.
- can they check to see if the oil pump is clogged? There was no discussion about the oil pump.
- change the o-ring and see if that does it, but I have no idea at what cost
- increase idle speed for now to keep the alarm away and trade in the car asap
- put a different oil in that will temporary help the problem and trade it in.Thoughts?