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2004 CTSV
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193 Posts
Discussion Starter #1
Hi guys. Im on my second differential with about 19k total miles on my 04 CTSV and 2k on the new differential. Neither differential ever leaked until a week ago. Anyways I get some drip each night that has been going on for about a week or so.

After reading a number of posts, its seems many have experience leaking from the differential fluid being overfilled by the dealer, but if this was the case on mine wouldnt it have happened sooner, like 2k miles ago when the new one went in?

Also how long can I let it leak before I go to the dealer? Im going to have them put royal purple in it but probably cant get there until this weekend. Its seems like just about half of the people here have leaky differentials, so is it even necessary to bring it in? PS. No whine but a lot of noise in the driveline.
 

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Registered
2006 CTS-V
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4,042 Posts
It's more a mess factor than it is an urgent issue (unless it's leaking so much the back end of your car is wet after driving, then is a REAL mess issue and more of an urgent issue.

Regardless, go have em fix it.
 

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2004 CTSV
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193 Posts
Discussion Starter #3
It's more a mess factor than it is an urgent issue (unless it's leaking so much the back end of your car is wet after driving, then is a REAL mess issue and more of an urgent issue.

Regardless, go have em fix it.
Yeah its just that they charge me $250 in labor to take out and put in my wheel hop kit when they remove the diff to replace it, which they will undoubtably do, or just change the seal. Might almost cost less to bring it to a shop to refill and replace the seal no?
 

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~2011 CTS-V Coupe & 2013 SRX~
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1,749 Posts
I would put the car on a flat level surface. Then i would put an oil drain pan under the differential and open up the FILL PLUG. Let whatever comes out drain until it stops, then put the FILL PLUG back on. Just maybe it is overfilled and coming out of the vent. Do not touch the DRAIN PLUG. This is easy to do, just crawl under by the exhaust. Use a 3/8 breaker bar with a 4" extension with the proper hex socket.
 
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