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.

A: If you lost all the oil in your engine afte...

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: Air not blowing

Hi. I am assuming you are talking about the a/c blower motor. I would say you have a bad blower motor resistor mounted on the blower case which would allow it to only work on high. But now, since the...

Q: Wondering how much it may cost to geta a vacuum leak fixed

A vacuum leak cannot be quoted if the vacuum leak location is not known. You will need to first have the vacuum leak verified and located then a quote for the repair can be made. Most vacuum leaks will cause...

Q: Can I replace crankshaft sensors on my own and where can I get a schematic/video?

Hi there. If your engine has a timing belt, then the crankshaft position sensor is located under the timing belt cover next to the crankshaft pulley bolted to the engine block. If your engine has a timing chain, then the...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...