Skip the auto shop - Our mechanics make house calls

Q: Oil Loss

asked by on

I recently did an oil change on my 4.6L Ford f-150. I put 5.7L of 5w20 vavloine oil in. I drove for probably 30mins and there was no more oil in it. The oil filter is tight and the drain plug is tight, with no sign of oil on the out side of the engine. Im wondering where the oil could of went. My best guess is in the bell housing, but am weary of separating the engine and tranny.

My car has 75400 miles.
My car has an automatic transmission.

If you lost all the oil in your engine after driving for 30 minutes, without any signs of an oil leak, then you need to put in oil until it is full to see how much oil was used.

If you put in more than a quart of oil then you should look at the bell housing for any evidence of oil leaking from it. If there is no leak from the rear main seal then check the exhaust for oil residue.

If the exhaust checks out then you need to have the crankcase ventilation system (PCV) checked for blockage. The PCV valve may cause oil to be ingested into the engine if the system is clogged. If the system is clear and free and working as it should then you have engine piston problems or valve seal problems sucking oil into the engine.

I’d suggest you get your car inspected by a certified mechanic who can perform these checks to accurately diagnose your oil loss. Good luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Something broke underneath my car.

Hello, without hearing the noise its hard to make a recommendation. If you hear a rattle sound it could be a loose bracket or loose bolt. If you are experiencing a clunking sound, you might have something loose in the...

Q: Overheating - 1996 Saturn

Hey there. You will need to not drive the vehicle if it is overheating since you may do engine damage if you overheated it. Have the system pressure tested and leak detected to see if the water pump is leaking...

Q: DRL System Light on

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...