However, a general guideline is that at idle (around 600-800 RPM), the oil pressure should be at least 10-15 PSI. As the engine RPM increases, the oil pressure should also increase, reaching 30-50 PSI at higher RPMs (around 2000-3000 RPM).
Crucially, consult your owner's manual. It will provide the most accurate and specific oil pressure specifications for your particular year and model of Buick Regal 3.8L V6. The manual will detail the acceptable ranges at different engine operating conditions.
If your oil pressure is consistently below the recommended range, it's a serious issue that needs immediate attention from a qualified mechanic. Low oil pressure can lead to serious engine damage.
