red line = leaky butt?

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Sep 16, 2009 | 09:58 PM

gja

Thread Starter

Racer

Joined: Jul 2006

Posts: 427

Likes: 0

From: Chicagoland IL

red line = leaky butt?

I switched to full synthetics back in May. I just recently discovered a few drops of oil on the floor, beneath the rear end.

Coincidence or does the new fluid cause a leaky butt?

Sep 17, 2009 | 07:44 AM

Gray Ghost GS

"AlohaC5" Senior Member

Joined: Jun 2003

Posts: 3,562

Likes: 44

From: Madison, AL

A leaking differential cover on the C5 is pretty common - I believe there is a GM TSB on this problem. Switching to Redline fluid and seeing these drops are a coincidence. I use the same fluid in my differential and engine - no problems just great performance.

Sep 17, 2009 | 07:56 AM

Quicksilver Vert 01

Tech Contributor

Joined: May 2008

Posts: 3,100

Likes: 17

From: Somers, CT and Clermont, FL

St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16

Changed fluid to Redline synthetic in my diff. over 5 years ago.

Seals never leaked before, or after the change to Redline.

Sep 17, 2009 | 04:40 PM

timemender

Burning Brakes

Joined: Aug 2006

Posts: 1,217

Likes: 5

From: Stark County Ohio

Could be coming from the vent located on the top of the differential, especially if overfilled. You should be so lucky – hopefully you are.

The seals on these differentials leak at any time no matter the age or mileage.

Sep 17, 2009 | 09:47 PM

gja

Thread Starter

Racer

Joined: Jul 2006

Posts: 427

Likes: 0

From: Chicagoland IL

thanks for the replies. i have gmpp, so let's see what the stealership says.

Sep 17, 2009 | 09:50 PM

ROJ#79

Drifting

Joined: Jun 2004

Posts: 1,484

Likes: 20

From: FLORIDA

MIne leaked before I changed it to Red-Line. But not after.
That's why I changed it!

Sep 18, 2009 | 07:40 AM

Quicksilver Vert 01

Tech Contributor

Joined: May 2008

Posts: 3,100

Likes: 17

From: Somers, CT and Clermont, FL

St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16

Quote:

Originally Posted by ROJ#79

MIne leaked before I changed it to Red-Line. But not after.
That's why I changed it!

A friend of mine had the same good results on his '03 coupe.

Sep 21, 2009 | 11:36 PM

gja

Thread Starter

Racer

Joined: Jul 2006

Posts: 427

Likes: 0

From: Chicagoland IL

So it wasnt diff fluid after all. The guy who installed my stainless steel brake line didnt tighten the rear right line. The fluid would leak onto the leaf spring, travel down toward the center of the car, then drip. It would strip some of the dirt off of the leaf spring, giving it a weird color, that led me to believe that it was diff fluid.

Who'da thunk it?