Q: Q: Oil Leak

asked by on

Have a slow oil leak towards the front. I have already replaced the front crankshaft seal and the oil pan gasket. What else could it be? Slow leak as in if I change my oil, by 3000 miles I am bone dry.

My car has 187000 miles.
My car has an automatic transmission.

Slow leaks can be difficult to find. Sometimes it can come down to the trick of putting a dye in the oil that glows under UV light and then you can see the leak glowing when you shine the black light on it.But before going there, let’s talk about the crankcase vent. One of the valve covers should have a hose that connects to the engine intake. This is to draw in the fumes from the crankcase and to keep a slight negative pressure on it. The valve cover itself will have some baffles and maybe a screen in it to prevent liquid oil from passing into the intake. Over time these screens become clogged and the crankcase cannot ventilate. The result is that pressure builds up in the crankcase and oil leaks out the seals. Cleaning out the screens and baffles can make a big difference in oil consumption. Your truck is old enough and has enough miles to where this could be your problem. If you decide you want to get someone to take care of this for you, contact YourMechanic. They can send a technician to your home or office to check out your oil leak and let you know what is the solution.

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

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: Hi thanks for this chance. Based on auto indicator I took my car for service. I had to pay $586

In my opinion, I don't believe that you were cheated. These seem like fairly standard prices for those services. If you would like a point of comparison, you can enter your vehicle information and the same services into our estimator...

Q: What would cause my 02 trailblazer to sometimes not accelerate when pushing on the gas pedal while driving?

If your RPMs are going up when you press the accelerator pedal but the vehicle does not move, this would be the transmission slipping. Transmissions can slip due to low fluid levels, poor fluid condition, or internal damage to the...

Q: Can I change my car oil from 5w-20 to 10w-20 because the oil is burning quicker?

The effect on oil consumption will be zero to negligible (these are both SAE 20 weight oils at operating temperature) and, in any event, any beneficial effect will be offset by the reduction in the efficiency of operation of the...

Related articles

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.