Skip the auto shop - Our mechanics make house calls

Q: Differential leak while speeding

asked by on

My Solstice with LSD - limited slip differential has less than 3700 miles on it. I had the rear end serviced at the dealership about 17 months ago. I recently noticed a slight leaking and dust accumulation of the differential. So I cleaned it and it drove easily with no problem. I drove home Thursday on the freeway at 90 mph. When I got home I could smell and see the rear end leaking. I topped off the oil and tried driving it at a normal freeway speed to recreate the leak. Today I drove up to 115 mph, pulled over to the side of the road and it had leaked onto the road. The differential and exhaust were oily. It’s coming down from the top left. The metal vent area is dry. Is the vent stuck open blowing a mist of oil at high speeds? The right axle seal is dry, but maybe it’s doing the same thing. I can’t hear or feel any grinding or chattering when I turn. Do you have any thoughts?

Hey there, thanks for writing in about your 2009 Pontiac Solstice. The first thing to try is to see if there are sealing washers on the plugs of the differential. If the washers have mushroomed or are worn, some fluid may been allowed to leak by. Make sure the proper grade of oil is used. If you try and clean it up, you may be able to see exactly where the leak is coming from. If you need help with this, consider having a qualified technician, such as one from YourMechanic, find the differential leak and have this issue resolved.

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: Why is my car not moving?

Hi There, This may be a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates...

Q: Why would transmission fluid leak?

First, we should acknowledge that the transmission, whether automatic or manual, is actually designed to hold the fluid without leaking. However, there are many factors which can cause a transmission to leak. Drying or hardening seals can cause leaks. Failing...

Q: My car has a problem with the manifold - 2009 Nissan Altima

Sort of taking a flier on this one, but I suspect the "fail" designation would be assigned if the exhaust manifold were leaking. If so, exhaust fumes could then enter the vehicle through the fresh air vents and cause carbon...

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...
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...
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...