Here's why it might drop slightly and when it becomes a concern:
Normal Behavior (Slight Drop):
* Reduced Engine RPM: When you release the gas pedal, the engine's RPMs decrease. The oil pump is driven by the engine, so lower RPMs mean lower pump speed and consequently, slightly lower oil pressure. This is perfectly normal and usually minimal.
Concerning Behavior (Significant Drop):
A significant drop in oil pressure upon releasing the gas pedal suggests a potential problem:
* Worn Oil Pump: The oil pump might be wearing out, losing its ability to maintain sufficient pressure at lower engine speeds.
* Low Oil Level: Insufficient oil in the engine means the pump has less to work with, resulting in lower pressure, especially under reduced load. Check your oil level immediately!
* Oil Pump Problems: Issues within the oil pump itself (e.g., a worn rotor, blocked pickup tube) can reduce its effectiveness.
* Oil Leaks: Internal or external oil leaks reduce the amount of oil available for lubrication and pressure generation.
* Clogged Oil Filter: A clogged oil filter restricts oil flow, reducing pressure.
* Worn Engine Bearings: Worn bearings allow oil to escape more readily, reducing system pressure.
* Thick Oil: Using oil that's too thick (high viscosity) for the operating temperature can restrict flow at lower RPMs. Using the wrong oil weight can be problematic.
What to do:
1. Check your oil level immediately: This is the easiest and most important first step. Low oil is a serious problem.
2. Check the oil pressure gauge: Is the drop dramatic or just a slight decrease? A consistently low oil pressure reading at idle is a significant red flag.
3. Listen for unusual engine noises: Knocking, ticking, or rattling sounds can indicate serious engine damage.
4. Inspect for oil leaks: Look underneath your Durango for any signs of oil leaks.
5. Consult a mechanic: If you observe a significant drop in oil pressure, unusual noises, or oil leaks, have your vehicle inspected by a qualified mechanic. Ignoring low oil pressure can lead to catastrophic engine damage.
In short, a slight drop in oil pressure when you release the gas pedal is usually normal. A significant drop, however, is a serious warning sign requiring immediate attention to prevent engine damage. Don't delay in getting your vehicle checked if you're concerned.
