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Discussion Starter #1
Backed the car out of the garage this morning and noticed some clear "oily feeling" liquid on the floor where the back of car was sitting. The car is 5 weeks old with about 3300 miles on it. Since it was clear and not red, I am thinking it was from the rear end. A quick look under the car and couldn't immediately spot where it came from, but enough dripped to cause a 3-4 inch run on the floor. I last drove the car two days ago to work, and there was no hard driving involved (but a lot of stop-n-go) and this is the 1st time I have noticed anything.

Anyone else seen this or have some thoughts. I'm probably gonna need to lift her up to spot anything, but probably will not have time for a few days with the holiday here.

Everyone have a great Thanksgiving.

AL
 

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Yep, yer right, diff fluid

Same thing happened to me. You need to get the diff cover replaced (ok so thats what was wrong with mine).

Mine dripped a bit for awhile, but then one day it started pooling - the next I took her in.

Good luck
 

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Happened on my Coupe earlier this year. First they replaced the differential cover seal. Another leak developed shortly afterwards. Next time they replaced the left half shaft seal, no problems since.
 

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First question is did it evaporate?

Sometimes water mixed with soot comes out the tailpipe when cold, this can be oily "feeling" but is not oil and perfectly normal.

Be sure its actually oil....ie, it won't evaporate......

JC
 

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N4C5S said:
First question is did it evaporate?

Sometimes water mixed with soot comes out the tailpipe when cold, this can be oily "feeling" but is not oil and perfectly normal.

Be sure its actually oil....ie, it won't evaporate......

JC

Good point!! On cooler days moisture will drip off yor ehaust creating what looks like a leak...:cheers: :cheers:
 

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Discussion Starter #7
The car has sat there for two days, so I would think if it was going to evaporate it would have. There was enough liquid to wipe up with a paper towel.

I am going to drive it tomorrow - I will have to check the stuff if it drips agains.

Thanks all for you input.

AL
 

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It's most likely from the differential, very common on C5s.
 

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Discussion Starter #9
If it is common for C5s, then even if you get the seals replaced - this may happen again?
 

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Sherylann and I both recently had the seals on the differential cover replaced, where the axle enters. Both were on the drivers side.
 

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Al_Cruz said:
If it is common for C5s, then even if you get the seals replaced - this may happen again?
Its been umm 14k miles I think. No problems since. If the job is done properly you won't have to worry.
 

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Discussion Starter #12
Drove the car about 100 miles yesterday. Stop-n-go and highway. Check this morning, nothing on the floor. Pretty strange.
 

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Yeah, mine did that for awhile. Then one day there was a big puddle (like 8" around), I took her in that day.

I guess keep an eye on it, if it gets worse, take it in asap. Otherwise, just keep an eye on the fluid level in the diff.
 

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Mine had the Clear Oily puddle under it one time. Was diff. oil and the cause was dealer didn't tighten fill plug after service. :flaming: At least an easy fix.

2k :cool:
 

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Ask c4c5 specialist or C5 tech, they put some extra stuff on to seal it so it doesn't come back. It may be on the other forum under FAQ or archvies. If you can't find it let me know cause I printed it out somewhere. :cheers:
 

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Discussion Starter #16
After two months this happened again. Guess I will have to take it in. The one thing this time - the car had set for about 10 days without being driven. I do remember looking at it after about 5 days - nothing. Then this morning I saw it. Bigger pool than the 1st time.
 

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Al_Cruz said:
After two months this happened again. Guess I will have to take it in. The one thing this time - the car had set for about 10 days without being driven. I do remember looking at it after about 5 days - nothing. Then this morning I saw it. Bigger pool than the 1st time.
So did you actually determine that it was the differential axle seal that was leaking.

BTW, sometimes seals will leak worse they just sit. If you started driving it regularly, it will probably stop leaking again.
 

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Discussion Starter #18
I am going to get under it tonight and see EXACTLY where it is coming from. Then I'll check the level. Now that my traveling is done for a while - I can drive it more offen.
 

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The driver side half axle DIFF seal and/or cover o-ring are famous for leaking. I just had mine replaced this week at 10k. I am pretty certain that it was the axle seal but the dealer also replaced the cover o-ring. Diff lube is a clear to amber color - definitely not red like ATF in your A4 or M6.

GOLD72
 
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