I have a 93 Buick PA Supercharged 3800. 175000 miles. Last August I noticed the oil pressure at 40 psi while cruising down the highway at 60 mph. At a stop light it was going down to the red zone almost. So I changed the oil and filter and all was good for a month when the water pump went out. Leaking. That was fixed late September. By November the pressure was low again and another oil change was done fixing the low pressure problem. The last few weeks however at times there is smoke coming from in front of the engine and a few days ago from below the water pump. I am replacing coolant quite a bit. When I check the oil and I turn the dipstick at an angle it looks green on the sides of the stick. A green black icycle was hanging below the thermostat housing too the other day. I have heard a few popping sounds while driving lately. The car runs good no overheating what so ever. Just losing coolant and now some smoke burning smells. Solid 195 200 temperature. So I guess the gaskets are shot? Or something worse. 27 year old car is it worth repair? Something I will not attempt.