1988 Buick Riviera

Too much oil will make the oil in the crankcase foam. When this happens the oil pump is sucking the foam (air) so your oil pressure drops. Check the oil level on the dipstick to make sure it's full but not overfull. I'd change the oil filter and see if it stops leaking. If you're good on both and the oil light comes on at idle I'd replace the oil pressure relief valve. It's a spring loaded gizmo located in the oil filter adapter assembly. If it's stuck open or the spring has lost it's tension it'll cause the light to come on. If that doesn't solve the problem then I'd just keep driving it. Low oil pressure at idle can also be an early warning sign of worn bearings. A thicker oil such as 10W-30 or 10W40 will help. But if it turns out to be worn bearings that's just a "Band-Aid". Eventually the engine will develop a rod knock. HTH. -Jim

was synthetic used? the seals will not hold it. it was designed for regular oil.

And too it could be a bad oil pump.

I got an oil change and swaped out my oil pressure switch it stopped leaking, another question can you put a super charged engine into a 88 riviera i heard of a buick reatta swap just wondering?

if you did , you need the transmission too. it needs to handle that power.