MXD

I'm sure there will be differing opinions on this but last night I put my truck up on the lift and soaked the undercarriage in a mix of motor oil and WD40. I got everything! I have done this once a year on every new vehicle I have ever owned. My last truck was an 02 that I bought new and when I sold it last spring the undercarriage (after a good cleaning) looked brand new. The new owner couldn't believe it had been through 10 New England winters and not a spot of rust. It's a messy job so I leave it parked on some crushed stone in front my house for day or two till its done dripping but I can tell you from experience that it's worth it if you live where they salt the roads.

09_XLT

I hope you don't have a well...

MXD

I don't and I should have clarified that 95% of it dripped off on the garage floor which we cleaned with simple green. The remaining drips were almost immeasurable. Not enough to make it through the stone to the dirt but enough to leave a drop on a freshly paved driveway. I'm not as Eco-unfriendly as I sounded.

116Rob

I used Fluid Film on my 2013. Sprayed the whole undercarriage myself.

MXD

I've heard good things about that stuff but it wasn't readily available to me and I've used the oil/WD40 solution for years so I stuck with it. I'll probably give that stuff a try in the future.

sullyman

Down here in Texas, alot of us go to the beach regularly. We haver found the best spray to prevent rust from the salt water and sand if to spray the under carriage with boiled linseed oil, available at any Home Depot, once a year or so.

It's inexpensive, effective, easy to do, and had no negative impacts.

johnwill

You talking about you put that on your wood gutters?

sullyman

I don't know the normal use for it, but boiled linseed oil works great to prevent rust.

The Dodge that I had for 9 years, and that had put around 20k miles on it on the beach and salt flats barely had any rust on it, and Dodges are known rust buckets. I also aspirated it up into all the wash out channels, and had no surface or body rust either.

jjfertig

My grandfather used to do that with his truck he owned in PA. It definately worked well but makes a heck of a mess initially. Only thing downside I noticed is it collected dirt initially. If your interested in a black undercoat that looks pretty, oil isn't for you.

MUFFMAN

I've been using the dripless oil on my vehicles. We have a lot plow truck thats 15 years old and still looks good. (Even though its a GM)