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Editor's Note; Thanks to Rat King Dave for providing this important knowledge as the Car Eating Season is upon us. Old article relevant info...

Are Bioplastics In Cars Leading To More Rodent Damage?

In recent years, the auto industry has become very focused on the initiative to “go green” with a major shift to try and reduce reliance on petroleum based products. This has led to a whole variety of car parts being made from different organic substances such as soy, corn, sugar cane, recycled wood, castor beans, etc. Building car parts out of these organic substances has enabled car manufacturers to create more environmentally friendly and efficient products, BUT it hasn’t come with out its consequences.

If you have read one of my most popular articles, Does your car have soy based wiring? you will know that soy based wiring is causing some very costly issues to newer car owners with rodents being attracted to the car engine wiring for food. This has resulted in a few recent class actions lawsuits being filed against both Honda and Toyota in 2016. Though soy based wiring seems to be getting all of the recent media attention, the fun isn’t stopping there. Car manufacturers are making a whole slew of other organic car parts and the damage reports are just starting to come in.

Here is a list of each of the organic car parts that we know of*:

  • Rilsan PA 11 – Made from castor oil and is used in flexible tubing and monowall fuel lines. Ford had agreed to use these in their vehicles.
  • Rilperm multi-layer fuel lines – Made from castor oil and is used in quick connectors, pneumatic brake hoses and friction parts. It is also used in conductive fuel pump modules for General Motors cars.
  • DuPontTM Zytel RS, PA 6.10 – Made from castor beans and sugar cane. Used in the 2009 Toyota Camry as the automotive radiator end tank. This was proposed to be used in all new Toyotas so this may potentially be in use for all current Toyota vehicles. Toyota was awarded with the Most Innovative Use of Plastics award in the Environment Category from the Society of Plastics Engineers (SPE) for this product.
  • Bioplastic head liners, sun visors and floor mats in the Toyota SAI and Prius.
  • Castor Oil based fuel lines in FIAT cars
  • Bioplastic door trim and panels, structural insert parts and air ducts for Mitsubishi vehicles.
  • Ford is in talks with Jose Cuervo to use agave fibers for wiring harnesses, HVAC units, and storage bins.
  • Mazda has announced that they have created a bioplastic that is 88% corn and 12% petroleum that can be used for electrical parts.
  • Soy based polyurethane foams in seat cushions and seatbacks for many 2010 to 2013 Ford models including the F-150, Mustang, Focus and Escape, including the Lincoln Navigator, and Lincoln MKS.

*It was difficult to find the information to put together this list. Many of the car manufacturers do not publish this information due to the proprietary nature of the technology being used and none of the above has been specifically confirmed directly with the car manufacturers. Much of the above was taken from public announcements that the car manufacturers made. Many car manufacturers have refrained from making recent announcements regarding the use of bioplastics in cars and I could imagine this has something to do with the recent lawsuits being filed and to try and limit their liability.

To make matters even worse, Ford has even created a 2016 Ford Cook Book with the different types of foods they use to make their organic parts!

Recent data has shown that the car manufacturers are looking to increase the amount of bio-based plastics in cars by 400% within the next 5 years. Given that the industry is showing no signs of slowing down the use of bioplastics in cars, this could just be the tip of the ice berg for rodent damage to cars. Hopefully these recent class action lawsuits with Toyota and Honda will ensure the appropriate testing is done on new bioplastics to ensure unwanted wildlife is not attracted to these parts.

Given the current disregard for responsibility by car manufacturers for rodent damage to cars, we can’t expect that they will change their stance any time soon. This ultimately means that it is up to YOU to stay protected and to keep an eye on things. If you haven’t already, please check out the article The 5 Minute Check That ‘Can Save Your Car (and your sanity!). If you find the presence of rodents, take action ASAP and head on over to the Home page.

I hope that this article has been helpful! For any questions/comments, please drop a note below!

Thank you!!

-Rat King Dave

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11 thoughts on “Are Bioplastics In Cars Leading To More Rodent Damage?

  1. Hello and thanks for such a thorough article.

    Certainly animal damage to cars, generators, radio transmitters, etc is not entirely new. Over 20 years ago I heard of parts of the country where porcupines(!) had begun craving rubber hoses, belts, and other rubber components.

    I can’t help but wonder if the problem may be more complex than just the presence of bio-polymers. While it is true that many of these critters have exceedingly good noses, the feedstock for most chemicals is so far removed from the final product that the simplistic “if it is made from corn it must taste and smell like corn” is suspect.

    My hunch is that the plastics might be part of the problem, but there may be other things at work.

    I am currently involved with two emergency generators with rodent problems, but I have no reason to think anything unusual is going on.

    For example, the house I lived in last year was infested by super mice. They didn’t have any interest in three different types of mouse traps with three different types of bait Peanut butter, bacon grease and commercial bait). And they were extremely bait shy, though eventually I found a poison that ate a bit of. The only thing that worked was glue traps. That is different from any mice I have encountered in my nearly 60 years. Also, Americans eat in their cars more often than ever before. That isn’t in the engine compartment, but could act as a lure to the area.

    Thanks again.

    1. Hi Rolf! You are certainly correct that rodents getting into cars and damaging wires has been a thing for decades. Rodent teeth continually grow so they need to chew on things to essentially trim their teeth. Given the long history of rodent damage to cars it has been difficult to prove that soy based wiring is exacerbating the problem, hence why all the lawsuits were dismissed. Regardless of what the reality is, car manufacturers are certainly benefiting from the damage being done by these rodents at the expense of the car owners and insurance companies.

      Separately, that is interesting to hear about the mice. When setting the traps be sure to set them flush against a wall. Rodents always prefer to walking next to a vertical surface.

      And, leaving food in cars is certainly not helping the situation lol.

      Appreciate your comment and glad to heed that at least the glue traps worked for you.

      Thanks! RKD

  2. RAbbits! 2015 Ford F-150 three times! First $1500 at dealers two weeks. Third last week vacuum hoses and BRAKE LINES! My 2016 Ford Escape this week all wires to harness severed, fuel line in rear chewed and panel under front bottom of car chewed everywhere. Rabbit hair stuck here and there. Someone will die when the brake lines are gone or when fuel hose leaks gasoline over

    1. Oh man Dlane! Those rabbits are relentless and are, unfortunately, really tough to defend against! Please review the article written on Rabbits for guidance. I hope this helps you! RKD

  3. Have had 2014 Honda Odyssey repaired 3 times. $1200. $1200, $650.

    Can’t keep rats, or mice, or squirrels away. Want to buy a new minivan. What kind? No bio wire coverings please.

    1. Hi Cindi! Oh man, I’m sorry to hear that the rodent just keep coming back for more (and I apologize for just replying now!). The issue is that the rodents have marked your car as “safe” with their urine and this acts as a signal to other rodents that this is a safe place to go. You need to implement some techniques and solutions that will start to make the rodents feel uncomfortable in your car (e.g. Leaving the hood up at night, shining bright lights, spraying with peppermint spray, etc.). I would highly suggest that you check out the Home page and review the steps on there. To answer your question, all the large car manufacturers are using the same type of wiring so no newer car is really safe. This is why it is important to implement some preventative techniques. I hope this helps! If you have any more questions, please let me know! Thank you! RKD

  4. I have s 2013 mercedes and wiring has been chewed by rodents. Mercedes wont just replace wires but want to Gut the car to replace entire harness. This will cost thousands. Do they use bio plastics, and soy coated wiring which attratxz

    1. Hi Bernice, I’m sorry to hear about your car! I’m not surprised that Mercedes would want to replace the entire harness because they are trying to rack up as large as bill as possible on the customer’s and the insurance company’s dime. You most likely have comprehensive insurance coverage so even if the cost is in the thousands your max out of pocket should be $500. As far as I am aware, Mercedes does use soy based wiring in their cars. And to be more direct, you can ask any dealership if they use soy based wiring in their cars to confirm. In certain states the Lemon Law requires a car dealership to disclose any facts that would be considered material to the person who is trying to make a decision on whether or not to purchase the car. Please let me know if for some reason they don’t tell you if your car has soy based wiring and I will reach out to some dealerships to confirm. Once you get your car back please remember to take some preventative action so that this won’t happen again! Check out the Home page and let me know if you have any questions. Thanks. RKD

  5. We need to buy a car and almost bought A RAV4 by Toyota .
    We already have mice problems with our old cars getting in fan area.
    You are saying most cars use soy products. So what is safe to buy?
    Maurice Lamarche

    1. Hi Maurice! This is a wide spread problem and to be honest I don’t know if there are certain makes/models that are safe. Car manufacturers are not taking any action to try and prevent this from happening and by introducing more bio-based products in cars, they are making things worse. This is specifically why we need to take matters into our own hands and figure out how to prevent damage from occurring in the first place no matter what car you have. I would highly suggest that you take a look at the article I specifically wrote for mice:
      Please let me know if you have any other questions! Thank you!