Skip the auto shop - Our mechanics make house calls

Q: Does a failing crank seal cause visible leaks on the driveway or garage floor in every case?

asked by on

I have been told I need to replace the crank seal. Service tech discovered a leak. I haven't noticed any leaks on the garage floor. Could this be a small leak, where there's not enough oil leaking out to be on the garage floor?

My car has 150500 miles.
My car has an automatic transmission.

A: I like to classify leaks when I see them, a...

I like to classify leaks when I see them, and I think these identifications could help in your case. I use three classes of leaks:

  • Class 1 = slight wet residue leak around area with signs of a drip forming under the leak but does not drip on floor. (Does not require repair yet and may be normal)

  • Class 2 = moderate wet leak around the area with signs of a drip forming and does drip once or twice a day. (Recommend repair when possible and is not normal)

  • Class 3 = heavy active leak around the area with signs of a drip forming and actively dripping at least 1 drop a minute. (Recommend repair now; may cause failed component)

I recommend having the same technician show you the leak and then asking about its severity. If you do not feel comfortable with that mechanic, an independent technician from YourMechanic can come to your car’s location to diagnose the potential leak for you and replace your crankshaft seal if necessary.

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

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: I've replace the fuel pump relay"main relay" and now I was told I need an ignition cool? What does it sound like the problem may b

You haven't really mentioned the symptoms, but I'm guessing that someone is trying to diagnose why your car won't start. If the ignition coil was tested and is known to be bad, then have that put in. However, if it...

Q: Regarding tire OE valve stem

Hi there. Maybe, the tire supplier is planning on providing new valve stems with your tire purchase. A simple test, to know which valve stem your tire has, is too check the valve stem for flexibility. A metal valve stem...

Q: Temperature gauge

It sounds like you may have a faulty temperature gauge or a faulty temperature sensor. As you may know, there is a sensor that measures the temperature of the coolant that relays this information to the computer which then sends...

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...
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...