Any back story? I would check the oil level again and if it's rising then I recall my old car with a leak in the head gasket where cooling fluid dumped into the oil pan.
What also is not known is regular service. Sometimes an old road machine is often left to chance about service. You dive in and just do all the usual service of filters, pump pressure checks and so on. This is pretty cheap over diagnostic time.
My vehicle is a 1998 Buick Regal LS. 6cyl 2.8 (automatic)
Some history, as it may be related:
About a month ago, it began stalling, once it reached normal operating temperature. (about 2-3 miles of driving)
As it turned out, my engine oil was WAY overfilled.
I got an oil change, bringing the oil level back to normal, and it seemed to fix the problem.
But about 5 days ago, after driving 20 miles, it stalled, again.
It started right back up, again, and I continued on.
After 10 more miles, it stalled once more. I started it back up, and got
home with no further stalling.
Then, last night, it stalled after about 5 miles.
I started it right back up, but only got about 100 feet before it stalled again.
This time, it either would not start, or when it did, would stall again, immediately.
I did this about 5-7 times before getting it to move another 50 feet, before
Finally, after waiting a couple of minutes, I was able to get it started and to a gas station about a mile away, and then home another 3/4 mile, with no issues.
Any ideas on what the problem might be, and how to fix it?