1998 Oldsmobile Intrigue.
Two days ago, when the temperatures began plummeting, suddenly lit up a red "sensor" light on the dashboard.
Since this whole thing's new to me, and it was a red light rather than a yellow one, I immediately pulled over to the side of the road and read the owner's manual.
"Needs oil change."
I checked. The oil was last changed on December 24, 2014, 1100 miles ago.
Mysteriously, the yellow sensor light that indicates "low oil level" has never not a single time ever gone on.
Since the RPMs (1500-2000) and the temperature (about a third of the way up, far below the red "danger zone") remained consistent and the car drove well, I returned home, although cautiously. If I hit a bump or a rough part of the road, the red light went off. And then it'd come on again when going over a long stretch of smooth road.
I've driven it since then--nowhere far, as there's other vehicles out here, owned by other people but for my use if I need any of them--and noticed it's after the car's thoroughly warmed up, that the red light goes on.
When the vehicle's cold, or if I go 55 mph or less, the red light doesn't come on.
I'm taking the vehicle into the mechanic in town this morning--it's barely 6:00 a.m. as it is--to have him take a look. But in the meantime, anybody have any ideas?