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Hello,I can help you with your buick oil pressure problem. This is the 3800 engine correct? Is engine noisey? Would be best to install a mechnical oil pressure gauge on your engine to see if you are actually losing oil pressure or we have another problem. this tells you exactly what the engine is doing. If you do not have one the cheapest thing to try is replacing the oil pressure sending unit.if sender is defective it will cause your problem. This sending unit is above the oil filter.
The oil light will come on orange if your oil level is low. The oil light will come on red if your oil pressure is low. The oil light will come on, then turn off if your oil level sensor needs replacing.
You could try thicker oil or stop using synthetic or add some lucas oil treatment or change the oil. The sender could be bad too. A diag is in order because if there is no presure the engine will soon die.
cheapest thing to do is replace oil pressure sender ,unless you have an oil pressure gauge to test actual pressure,sender should be near oil filter housing could be 1 to 3 wire connector,you'll need special socket to r&r part,also make sure car idles normal when hot, if surging or low you may get light flicker in drive.