A low oil message came on my '08 V8 XC90 today with a yellow triangle. Not low oil pressure with a red triangle, but low oil level with a yellow triangle. I was almost home when it came on, so made it home no problem. When I check the oil level with the dipstick it looks like it's perfectly fine, not low at all. Starting it up again, the low oil level light doesn't come back. Records show it was changed shortly before I bought it, about 3000 miles ago.
I didn't realize we even had an oil level sensor. After some brief reading, sounds like this message can come on not only for a low level, but also low oil quality somehow? What is the sensor actually measuring? Any way to diagnose if the sensor needs replacing? Should I just do an oil change ASAP with known good oil (normally Mobil 1 5w30) and see if the message returns?