[bradfa]

Chevrolet and GMC full size pickup trucks and SUVs are probably the worst offenders. Which seems counter intuitive since many of GM's engineering and design happens in northern climates with salted roads. It's not all of GM's vehicles which are subject to this, many do have good corrosion resistance, they just choose to only use such techniques on a subset of the vehicles they produce.

For example: https://static.nhtsa.gov/odi/tsbs/2020/MC-10178959-9999.pdf

A few years back now Toyota had a big recall on Tundra pickups for improperly applied corrosion prevention. I'm to believe they corrected this as it was quite expensive for them to repair so many customer vehicles.

[ghaff]

Just had to get rid of a 2011 Toyota SUV because corrosion on a hydraulic line cascaded to other problems. (Was overall in good shape but some sort of chip or other problem on the line caused issues.)

[rasz]

>A few years back now Toyota had a big recall

Mustie1, absolute YT gem of a human being, did a couple videos showing his efforts to salvage post recall Toyotas. Recall was a scam. Instead of replacing bad frame, or stripping, cleaning and repainting Toyota opted to pay third party contractor to just spray some black goo on frame rails so they last 12 more months while the goo hides corrosion (and traps more moisture speeding up the process).

RRRUST 2013 https://www.youtube.com/watch?v=9s7N8QEAAeM

toyota 4runner frame rust repair 2013 https://www.youtube.com/watch?v=gBB8YX1I1QU

more toyota frame repair 2013 https://www.youtube.com/watch?v=hdLNKOdi4-A

Toyota Tundra frame repair 2016 https://www.youtube.com/watch?v=5IBXYnYYccI

toyota tundra rusted frame repair update 2 winters later 2018 https://www.youtube.com/watch?v=nn-cqoVYQR0

TLDR involved welding plates to replace eaten metal and regularly coating in oil/liquid film protection every year.

[bradfa]

Interesting. It was my understanding that the official Toyota procedure involved lifting the cab and bed off the existing frame and transplanting all of the rest of the truck to a new frame.

This seems to outline the requirements: https://static.nhtsa.gov/odi/tsbs/2019/MC-10154787-9999.pdf

The warranty work is listed at about 40 hours of duration for frame replacement, which seems rather short to me. For about a million potentially affected vehicles that's not a cheap recall.

[rasz]

Maybe thats what they were supposed to do, but the post recall trucks Mustie1 worked on all looked the same - spray of hard coat over the corrosion/holes the size of a fist.