I interested in a 1990 Vanagon that I found posted online. I've
emailed the seller but haven't been able to talk to them yet.

They describe it as having engine trouble. They state that "it runs,
but after about 10 minutes, the oil light comes on and makes a loud
beeping and you can no longer accelerate."

Any thoughts on this and what I might ask when I finally do get a
chance to speak with them directly?

Thanks!
Mark K
1986 GL/2WD/4SPD