Q: Gray oil under oil cap

asked by on

Vehicle shows Gray Somewhat Foamy Oil under the Oil Cap. It's not milky nor Shooting massive smoke out the tailpipe Either. The Dipstick Shows Clean oil on it. This is after running the car through the gears ext ext. Car dosent overheat. Fluid levels of oil or coolant dosent decrease Either. I'm not short tripping the car. I've actually left it running after trips for about 20 mins to check and see.

My car has 92500 miles.
My car has an automatic transmission.

There are quite a few labs (just do Internet search) that perform passenger car engine oil analyses and such a service is economical as it is done through the mail. Visual observation, in the circumstances you are describing, will not tell you much; instead, obtaining a lab report will tell you exactly what is in the oil. When I say, "your circumstances", you are reporting no change in coolant level; consequently, the most likely explanation for the gray color observed under the cap is condensation. If you desire a further, on site, inspection please feel free to request that using YourMechanic’s service request link. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Gray oil under oil cap

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Put donut on.but it won't spin

You have either put the spare tire space saver on backwards or you have one that is not compatible with your car. If turning it around does not fix it then you will need to have the tire repaired or...

Q: oil is leaking onto the MAP sensor...and is intermittently stalling

If you were told that the upper intake needs to be replaced then this may cause problems with the MAP sensor and the way the engine runs. A MAP sensor is very important to controlling the fuel strategy to the...

Q: Parking brake dash light doesn't come on when using the actual parking brake so I failed inspection. I don't know if it's the bulb or parking brake.

Hello. The dash light not illuminating when the brake is applied is very likely a wiring issue. If you are knowledgeable with a voltmeter, you can pull a wiring diagram of the circuit and trace the issue. This is done...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...