Oily residue on back of truck? - Chevy and GMC Duramax Diesel Forum
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Old 11-06-2011, 05:06 PM   eBay Motors  #1 (permalink)
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Oily residue on back of truck?

Hey guys, got a question!

I've put about 1000 miles on my truck since I picked it up 3 weeks ago. I washed it about 300 miles ago, and when I was filling it up today, I noticed the entire back of the truck had a thin oily film on it, from the back tire back. Is this a normal thing these trucks do, or do I have a leak to track down?

Thanks
-Rob
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Old 11-06-2011, 05:15 PM   eBay Motors  #2 (permalink)
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Is it on both sides? It could be from too much tire dressing being applied. is it on the tail gate or only after the exhaust? Check all your fluids to be safe
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Old 11-06-2011, 05:19 PM   eBay Motors  #3 (permalink)
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It's on both sides and tailgate, only behind the rear tires. No tire dressing ever on the these tires, so that's not it.

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-Rob
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Old 11-06-2011, 05:26 PM   eBay Motors  #4 (permalink)
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well then, check under neath and see if fluid is maybe heaving out the rear diff?
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Old 11-06-2011, 05:33 PM   eBay Motors  #5 (permalink)
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If it is under warranty, take it in. Sounds like you may have a leak of some kind. Check the ground where you park it over night and see if there is any evidence of a leak there. It has been cold the past few mornings here in SE Michigan. Something that may seal well when it was warmer may not be sealing as well now. This is the time of year everyone begins to notice their trans cooler lines leaking. Keep us posted.
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Old 11-06-2011, 05:52 PM   eBay Motors  #6 (permalink)
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What year is this? (sorry on my phone can't see your sig)


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Old 11-06-2011, 07:04 PM   eBay Motors  #7 (permalink)
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Thanks guys! The truck is an 07 LBZ with 108k, so no warranty here.

It seems as though I'm one of the lucky ones. I'm guessing these are the trans cooler lines, passenger side under the bumper.



Are they a tough fix? Do they normally leak enough to cause a huge problem?

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-Rob
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Old 11-07-2011, 03:28 AM   eBay Motors  #8 (permalink)
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They can leak enough to cause big problems, a few of the vendors like alligator performance have an aftermarket line kit that is easy to install and will take care of your problem, it will be money well spent.
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Old 11-07-2011, 05:22 AM   eBay Motors  #9 (permalink)
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Thanks guys, I've seen the Alligator kit, and the Husker diesel kit. Are there any others out there I should consider?

Thanks
-Rob
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Old 11-07-2011, 05:40 AM   eBay Motors  #10 (permalink)
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Allseason makes a good one.

I just took the lines off and took them to a hydrolic line shop and had them recover the ends and hard lines, then had them smooth crimp new stainless braided hose onto my lines so they will last forever now. Plus, it was cheaper than new lines from GM that I know will eventually leak again................
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