Q: Oil Loss

asked by on July 09, 2016

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.

Oil level is low Inspection $94.99 - $114.99 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do you use the automatic rearview mirror in a 2012 Ford Escape?
If your car is equipped with an automatic dimming rearview mirror, you have a convenient way to reduce the glare from cars behind you without having to do anything yourself. The mirror does it on its own. The automatic rearview...
Oil leaking from car.
We need to determine in what area of the car the oil leak is coming from. If it's in front of the motor it could be a front main seal or camshaft seal. If it's near the rear of the...
My brakes are not working very well
A hard brake pedal indicates a lack of power assist, so you're on the right track with the brake booster. Lack of power assist may be due to low engine vacuum, a leaky vacuum hose (https://www.yourmechanic.com/services/vacuum-hose-s-replacement) to the brake booster,...
Car shakes on starting, loses power & stalls uphill
Hello there, a few different faults can cause this sort of problem. In most cases, with the steering wheel locking not shifting into park and the limp mode you have experienced. It would be more likely there is an electrical...
Alternator problem, the wipper stops as soon as you take it to the highest,cracking sound in the morning that stop after cluching
Hello. From what you describe it would appear that the vehicle is experiencing more than one issue. The first thing I would address is the alternator, as a faulty alternator can leave the vehicle stranded if the battery dies. I...
Truck will act like it is not getting enough fuel when cruisng. RPMs drop then comes back up or under load
Hello. I think you have called it, this is almost certainly a fuel supply issue. Installing a fuel pump pressure gauge which can be observed while driving will confirm this. Sources could include a worn out fuel pump (https://www.yourmechanic.com/services/fuel-pump-replacement), a...
Throttle body needs to be replaced
Hello, thank you for writing in. It is difficult to say if the vehicle is safe to drive. If the vehicle performs well enough that you can drive it short distances, then you can continue to work with it within...
Rough idle and stalling after coming off the highway.
Hi there. Sometimes the best fix is the simplest solution. On you list of things you have completed, what is missing is cleaning fuel injectors and the throttle body. Typically idle issues and stalling after frequent fuel delivery (like on...
Shifting an automatic transmission
Sport mode permits gear shifting at higher engine RPM which favors quicker acceleration and more power. There could be some additional wear and tear on the vehicle drive train when using Sport Mode, whether the shifts are automatic or manually...

Related articles

Why Are 5W-30 and 5W-20 Oils So Common?
Changing oil is one of the most important car care tasks. Most cars use 5W-20 or 5W-30 oil because those oils work best in hot or cold temperatures.
The Best Used Cars to Buy If You're a Gardener or Landscape Architect
Gardeners Gardeners and landscape architects need to haul around quite a bit of gear. As a gardener, chances are you will need to transport a variety of mowing equipment, along with smaller implements. You may also need to move shrubs,...
Symptoms of a Bad or Failing Vent Oil Separator
Common signs include smoke coming from the exhaust pipe, the Check Engine Light coming on, excessive oil consumption, and sludge under the oil cap.