Thank you to all who replied to my previous post.  Since I was behind in
meeting my clients' needs for consulting services, I took van to local
Tires Plus.  Drain plug was replaced ($14.99 plus cost of oil and
filter, etc.).  Only downside is oil in engine is Pennzoil synthetic
15W-40 instead of Mobil 1 15W-50, and oil filter is PZ12.  Upside, was
that mechanic found some other more serious problems, inclduding the
passenger side sway bar link deteched from the control arm.  Tires Plus
could not locate replacement busings, nut, sleeve,  etc.

John