Q: How much oil needs to leak into an Alternator to cause the Alternator to go bad

asked by on April 29, 2017

I sent my car with my Mechanic Friday afternoon to fix brakes, change fan and computer. My mechanic said car would be done and returned Saturday morning. Saturday afternoon, he calls to tell me that I need a new battery and alternator. He said he drove it made several stops and Saturday morning took it to pick up parts. Upon returning to my car it would not start. He removed the battery took it home to charge and found battery and alternator needed to be replaced. Alternator had oil leakage in it. He replaced battery and alternator made several stops again and dropped my car off Sunday Evening. My husband drove the car Monday morning to drop my son off at work and upon returning home battery lights came on radio died and car died. He had to push car into parking stall. I called the mechanic and he came to diagnose the problem. Took the alternator, battery and its been a week. He now comes and says I now need a new battery, alternator and gasket valve.

My car has 100000 miles.
My car's transmission is unknown to me.

It would be difficult to say exactly how much oil it would take to cause the alternator to fail. However, oil leaking on the alternator due to leaking valve cover gaskets can cause it to fail. It seems as if the technician who is servicing your vehicle may not have performed a courtesy inspection to check for other potential issues prior to starting the other repairs you had requested. I would recommend having the alternator replaced if it has oil leaking on it as well as resolving the valve cover gasket leak to prevent it from happening again. You may try to use a different mechanic who is more upfront and honest in the first place. Consider YourMechanic as services such as this can be completed from your home or office.

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

Hours of Labor to replace the water pump

I looked into the labor time on this online for you. It looks like this job takes about 2.7 hours to do this job. Consider YourMechanic for your water pump replacement as a certified professional can come to your home...

Multiple leaks in main gasket

Hello. If the leaks are coming from where the engine and the transmission come together then you have a rear main seal leaking or a front pump seal in the transmission. The transmission needs to be removed in order to...

Crank no start - 2002 Hyundai Santa Fe

Hey there. I would expect that you have a Check Engine light on, and there are problem codes set which would be helpful. Leave the coil wiring connected, remove a spark plug, keep the metal casing grounded, and turn the...

Related articles

Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
A Buyer’s Guide to the 2012 Hyundai Elantra
Car Car buyers looking for an economical, fuel-efficient sedan that’s also a little sporty and very attractive will love the 2012 Hyundai Elantra. Not only does it have a great list of standard features that any driver would enjoy, but...
The Best Used Cars to Buy If You Just Retired
Here’s Here’s a cruel, hard fact – car manufacturers no longer target seniors. Instead, they devote their time and energy to appealing to the 18-45 demographic. Still, some features make certain cars more suitable for older drivers. We have...