97 Silouette oil pressure light

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?

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