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2008 Yukon oil pressure light comes on, 166,000 miles.

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Replaced engine, used engine 33,000...
2008 Yukon oil pressure light comes on, 166,000 miles. Replaced engine, used engine 33,000 miles with warranty for 36,000 or three years. The light tells me to stop engine immediately. The engine has been performing well for three months. When I checked the oil, oil was low. I added two quarts. The light went off and I drove it 10 ,iles home with no incident. In the morning, I drove it and before I went around the block, the light came back on and told me to stop the engine immediately, oil pressure low. What should I do?
Submitted: 2 years ago.Category: GMC
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Answered in 19 minutes by:
2/15/2016
GMC Mechanic: xsvectOR, ASE Certified Technician replied 2 years ago
xsvectOR
xsvectOR, ASE Certified Technician
Category: GMC
Satisfied Customers: 17,483
Experience: car expert!
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was the oil low again?

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Customer reply replied 2 years ago
No
Customer reply replied 2 years ago
Are you available to chat now?
GMC Mechanic: xsvectOR, ASE Certified Technician replied 2 years ago

yes

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Customer reply replied 2 years ago
Just got back to a console, are you available now?
Customer reply replied 2 years ago
Checked the oil again and it is full. Today, I started it up and the warning light "oil pressure low, stop engine" is off and there was no check engine light on when I started it. So, I drove to the gas station and the car wash, the check engine light came on at the car wash, but it seems to be running and functioning fine. However, the oil pressure indicator is fluctuating up and down. Even though it is full of oil, the pressure indicator shows less than 40 and up to 60, then 20. Its strange. I know the last motor had over 100,000 and I took it to GMC when the engine light came on. They installed a baffle in the oil pan and told me that the hybrids have been having problems with too much oil pressure in the 1st two cylinders. This worked for about a year, then I started having more problems with the old motor. It fouled plugs 1 & 2 about every 3 to 6 months and I would replace them instead of paying for a new motor. So, I know there is a defect with these motors.
Customer reply replied 2 years ago
I drove the Yukon this afternoon with the engine light on and it ran fine. What would cause the oil pressure to fluctuate that way?
Customer reply replied 2 years ago
John, where are you?
Customer reply replied 2 years ago
Answer the question
Customer reply replied 2 years ago
I had a lot of things to do.
Customer reply replied 2 years ago
Are you here?
Customer reply replied 2 years ago
Asnwer the questions please
GMC Mechanic: xsvectOR, ASE Certified Technician replied 2 years ago

im here I apoligise had a busy day at the shop.. did you pull codes for the engine light ? Do you have a scan tool?

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