You can stop the alarm by removing the engine, getting the crankshaft out for a regring and fitting new oversize bearings. Unfortunately by the time the alarm sounds the damage is already done. First it sounded because there was no oil pressure. Now that you have new oil, the already damaged bearings are causing the low oil pressure which is causing the buzzer to sound. Continueing to drive the vehicle in this state will eventually damage the crank and block beyond repair. It is not a costly job should you decide to DIY. DIY should not be more than $100 for a new set of big-end and main bearings and a crank resize. It would be a good idea to swap out the oilpump as well while you're at it.
Check teh oil light pressure switch on the engine they often have a rubber boot over the wiring connections ,these boots tends to fill with oil throwing the oil light switch on ,must be a american market one because i have never seen this buzzer on the europeon ones
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