A bent valve can cause a drop in oil pressure due to the loss of compression in the affected cylinder. This is because the bent valve will not allow the piston to fully compress the air and fuel mixture, which results in a loss of power and efficiency. As a result, the oil pump will not be able to circulate oil as effectively, leading to a drop in oil pressure.
2. Drivability
A vehicle with a bent valve may be drivable for a short distance, but it is not recommended. Driving with a bent valve can cause further damage to the engine, including damage to the piston, cylinder head, and crankshaft. It is important to have the bent valve repaired as soon as possible to prevent further damage to the engine.
In your case, you have a VG30E V6 engine. This engine is known for being relatively reliable and durable, even with a bent valve. However, it is still not recommended to drive with a bent valve for any longer than necessary. If you must drive the vehicle, do so at a slow speed and avoid putting any unnecessary strain on the engine.