Which component stabilizes oil pressure at all speeds?

The oil pressure relief valve plays a crucial role in maintaining stable oil pressure throughout the engine's operating range. Its primary function is to regulate excess pressure within the oil system. When engine speeds increase, the oil pump generates greater pressure; if this pressure surpasses a certain threshold, the relief valve opens. This prevents damage to engine components by allowing some oil to bypass the system and return to the oil pan, thus lowering the pressure to a safe level.

This regulation is essential, as it ensures that regardless of engine RPM or operating conditions, the oil pressure remains within the manufacturer's specified range, which is vital for proper lubrication and engine longevity. Other components mentioned, such as the oil pump and oil cooler, have their specific functions, like generating and managing oil flow or temperature, but do not directly manage pressure stability across varying speeds the way the oil pressure relief valve does.