Oil Pressure

I just bought a 1991 Lumina Eurosport about 2 weeks ago, and about 2-3 days ago, I knowticed that the oil pressure has been dropping down to 0 as the car idles, and then jumps back up to around 40-50 psi when driving, and I was just wondering if this is normal for this car, or if it is something I should look into? I let the car idle in my drive way for a little while with the pressure supposedly at 0 and the engine wasnt making any weird sounds or anything so I was just wondering If this is normal for these cars or not?

Thanks
JayCub

Got oil pressure problem too on same car(90 Lumina/3.1l). At cold start oil pressure OK. After it warms up the pressure gets so low the warning light comes on, but only at idle or low speeds ie: parking lots. Hit the gas and pressure goes up but not very high. Any info where the oil pump may be or what the problem may be?

I found my owners manual and it says that it is sometimes normal for the oil pressure light to come on at idle, I also just did an oil change and put a little thicker oil in the car and that helped the oil pressure go up while going but not at idle, I think sometime this week I might take my car by a shop and ask them about it, and see what they think.

if your oil pressure did go two zero your engine would turn too junk real fast it could be the oil sending unit

Check for oil leak under the car. I agree with logan: it could be the oil sending unit (leaking). Replace it as soon as possible (it may cut the fuel off). Been there, done that.