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Oil or Undercoating?

McCree

By McCree
in Troubleshooting & Recalls

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McCree New Member

McCree

Posted
Posted

I'm looking at a 2014 crew cab Sierra Z71. The truck has 20,XXX miles on it and is beautiful inside and out. The under side however is covered with an oily substance. At first I thought it was engine oil but it literally covers everything from front to back, even inside the engine compartment on the inner fenders, brake booster, battery tray etc. I even noticed it between the bottom of the tailgate and the rear bumper. The dealer thinks it's a bad undercoating job. Due to the extensive coverage I can believe this but it still worries me. The truck has a clean Carfax. It is a one owner vehicle from Ontario, I'm in Indiana. This is my second concern. Should I be concerned with a truck from the north due to salt and rusting? I had a 2002 years back that originated in Canada and it rotted out but then again lots of 02's did. Maybe that is why it has the oil undercoating? Please share your thoughts with me. I really want to buy this truck but I need a little more warm and fuzzy feeling about the oil/undercoating before pulling the trigger. Thanks!

newdude Senior Enthusiast

newdude

Posted
Posted

It most likely isn't a bad undercoat job, but a Krown undercoat job. https://www.krown.com/ and https://www.krown.com/products/aerosol-products/krown-rust-protection-and-lubricant/ It stays as a fluid rather than a rubberized coating.

 

https://www.krown.com/research-development/ #1 in Canada. Stuff like Ziebart doesn't repel moisture like this, Fluid Film or Boeshield do.

 

And...

 

What is the difference between Krown and "undercoating" products?

 

Undercoating is an old technology designed to cover the exposed surfaces of your vehicle with a wax or tar based coating. While these undercoating products look good at a glance, they are not truly effective in protecting your vehicle. Undercoating products do not have the ability to creep and penetrate in the seams, spot welds and other hard to access areas of your vehicle like Krown will. These are the areas the rust is most likely to form! Also, as these coatings wear, crack and become damaged they can actually trap moisture against the metal surfaces of your vehicle and accelerate corrosion. Many people classify Krown as an undercoating or rust proofing product, but Krown?s unique formulation is able to protect your vehicle in ways that traditional undercoating cannot!

 

Its a good kind of rustproofing rather than an undercoat.

McCree New Member

McCree

Posted
  • Author
Posted

Well I got the original dealers info off the Carfax and verified that it was indeed undercoating. This gave me the warm and fuzzy I needed to buy the truck but unfortunately when I called it was already gone. Guess it wasn't meant to be. :-(

Donstar Senior Enthusiast

Donstar

Posted
Posted

Well I got the original dealers info off the Carfax and verified that it was indeed undercoating. This gave me the warm and fuzzy I needed to buy the truck but unfortunately when I called it was already gone. Guess it wasn't meant to be. :-(

There are a couple of threads on this forum about premature rust issues on many 2014 truck frames. There are also several threads on other issues such as vibration problems etc. These issues don't apply to all 2014's but I do not see the same type of issues (for the most part) with the 2015,s and 2016's. I have, when possible, avoided purchasing the first model year of a major design change. You might still find a great deal on old inventory of 2015's!

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