97 Silouette oil pressure light

[mixbrix]

We just borrowed my son's van to go on a trip. Being the nice father that I am, I decided to change the oil and filter. I put Pennzoil 5w30 oil in it, and now, after it's warmed up, when it idles the oil pressure light comes on. I thought maybe the lube place was actually using 10w30, so the next day I drained it and put 10w30 in. Oil light still comes on. Does this mean it's going to explode one of these days?

[mixbrix]

Oh well, no answers here. We're leaving on the trip tomorrow. If it explodes, I'll let ya know.