[TerryK1]

I had the exact same problem with the same year van. It turned out it was the front seal (gasket) on the oil pan. It was installed incorrecly at the factory and it finally pushed out after 170,000 km. It was relatively easy (but time consuming) to fix, I just had to remove the right front wheel, harmonic balancer, etc. and drop the pan a few inches. Cleaned it all up, put in a new seal, bolted it all back together and it's been fine for a few years now.