The key idea is that oil pressure and oil quantity limits are there to confirm the engine is being properly lubricated and to flag problems when anything is outside the specified range. When oil pressure stays within the approved range, the lubrication system is delivering oil to bearings and moving parts as designed, which is essential for preventing wear and overheating. If the pressure reads too low or too high, it can indicate issues such as a failing oil pump, clogged filters, worn bearings, blocked galleries, or abnormal oil viscosity—all of which raise the risk of serious engine damage. Similarly, the oil quantity limit checks that there’s enough oil in the system to provide adequate lubrication; too little means imminent risk of insufficient lubrication, and too much can indicate overfill or other faults that can affect lubrication performance or damage components. By staying within limits, you’re confirming proper lubrication, and any departure from those limits signals a potential engine problem that needs attention.