2020 Silverado Duramax15month Underbody Review and Frame Coating Touch Up 

Well this video turned into an ASMR real quick :) I enjoyed.

My 05 silverado is still super shiny under the original coating. Thanks for posting this video. Was doing a complete suspension refresh and I completely freaked out when I saw the soft coating coming off, I had no idea it was a wax coating. Was about to paint it with KBS Rust Seal but thank God I did some more research. I much rather touch-up the waxed areas with a fluid coating that will fuse with the existing layer than to strip off the whole frame to paint it. Thanks!

Thanks again Chad...I have the same truck as you but it's just in LT trim even the same color! I also bought two cans of NOX-RUST for touching up the frame. When I got my new truck home in March 2020 I even dropped the spare tire and heat shield and touched up those areas and sprayed the rear axle too while I had good access. I live in Maine on the coast and we use a ton of road salt for ice storms, I made my own separate speed wrench tool to quickly drop my spare tire so I can wash out that area every Spring, it's amazing how much sand and salt end up on top of the spare steel wheel and how quickly rust can start! You and some of the other towing reviews are the reasons I picked my 2020 3.0 Duramax Diesel, after owning many other full sized GM 1500/2500 this one is a keeper. My last GM diesel truck was a 1983 C2500 with the 6.2, no comparison, my best towing pickup was a 2001 C2500 HD with the 8.1 gasser 3:73 best MPG was 12.5! I'm looking forward to your next GM Engineering interview video and keep up the great work!

GM's wax coating is a joke imo . It's not self healing what so ever . My 2015 was rusted pretty badly after about 4 years of Canadian winters . I know a few guys who use fluid film and coat the entire undercarriage . They have had good experience with that so far .

Just curious on how the paint is holding up around the fenders and lower body panels. I know that the paint isn’t as thick as it used to be. Keep up the good wok👍🏻

Considering the price and the length of time it takes to pay the loan, today’s trucks need to last at least 20 years even in the salt zones Problem is the sheet metal will rot away long before the frame

Nh oil or hinder rust or amsoil works really well

How is it holding up so far?

Why don’t you take it to the dealership? The dealership told me that if the frame shows rust, they will take care of it as long as the vehicle is under warranty. And indeed, Chevy when I took my truck to the dealership applied the greace coating (or what they call it), without any hassle.

Chad, quick question. On your truck, when looking at it from the front. Is the passenger side, top louver or air shutter thing (behind the grill) missing? Mine is, but my dad has the gas high country his is there. I have the ‘20, 3.0 diesel and mine is missing. Not sure if it fell off or by design. Unfortunately, there are none on the lots down here where I can compare. The service lady showed me a parts catalog and all the louvers were there on the parts book but she didn’t know if there was a difference between the gas/diesel.

Thanks for going through this. I have a 2021 GMC 3.0 LM2 that I’m getting ready to coat before our MI winter. I’m considering using fluid film again as I did on my 2018 Jeep Rubicon that had rust when I bought it with 7 miles on it. The frame looked better than brand new after 3 winters with the only downside being a layer gunk that helped protect it, but was also messy when I worked on the underside of the Jeep. Any thoughts or downsides of using FF instead of the OEM wax stuff?

I love how thorough your videos are. Great truck. And nice flag you've got hanging in your garage, don't let anyone bully you into taking it down.

Just by covering over the rust after picking it with your fingers seems ridiculous. That wont stop the rust. I use a great product called woolwax on my chevy .It holds better than fluidfilm snd is lanolin based.

👍👍👍👍

My 2020 with 25k miles had its high pressure fuel pump explode. Check engine light came on , didn’t see any issues in power or fuel consumption.

How’s the undercoating holding up for you?

I wish gm would just say once a year detail and recoat. Because that seems to be what's needed.

so chad my 2020 1500 dura wouldnt key start died in a intersection it had been cold in Florida but the dealership is saying a tranny module but i just watched youre video on this now im thinking def system any thoughts

GM GET YOUR ACT TOGETHER. Unacceptable rust.

Where can this product be purchased?

Stuff is useless anywhere (like here in the northwoods of Wisconsin) which sees a REAL winter though. The ONLY way to stave off rust is to religiously wash the underbody during the winter season. No need when it's under 20 but on those occasional streaks of "good" weather when the roads are dry and clear....it MUST be done. But even then, the powder residue stays on the surface and finds it's way into spots no undercoating will reach. You just deal with the fact there will be rust....

My 2012 tundra with 227k miles has as much rust. My tundra spent most of its life in Ohio.

These fabric fender liners trap so much salt dirt, its the worse thing to have on vehicles. I had to remove mines and undercoat with Dupont undercoating

I buy black wax coating "undercoating in a can" from www.PetroleumServiceCompany.com as it is a near perfect match to the black wax coating that comes from the GM factory. I check the under body before snow flies every year and apply as needed.

You need to do a better job of cleaning before applying the coating. Even light dirt/dust will render the coating useless. Best bet is to pressure wash everything, wait to dry, then apply.

how lucky are you to have a lift.

This stuff is complete garbage. Not sure why GM does this on their full size trucks way back since 90s. Go look at a Colorado frame (real paint) and its mint. Spray fluid film over this trash and it turns to a grease. My next truck will come with a painted frame.. this coating peels back and collects salt and moisture behind it and falls off in chunks. Dont bother using the noxrust. Use fluid film or woolwax. Its your best bet to keep the frame from rotting. Yes I am bitter. Lol. My 2016 is rust free as I treat it yearly but it "looks ugly" due to the build up of lanolin. Good luck

Oil. I say again...Oil.

pure junk !!!!!!!!!!!!! come on for the price e-coat it !!!!!!!!!!!!!!!!!!!!!!!