It's just not worth the frustration to deal with these shit warranty companies.
I lost my work truck when we moved here. Driving the 2500HD back and forth to work became expensive so I bought the Colorado. About a week later the oil light came on. Low oil. Filled it up and a few days later it came on again followed by a misfire code. I won't bore you with the details of the whole episode but at some point the service manager approached me with the idea I buy an extended warranty. He was like wait a month, claim the engine, and you'll have a new engine and a warranty. I declined because first, I'm no choir boy but that's not cool. Second, this is between you and the mook who traded the truck in, don't drag me into it. Third, if my claim was denied I might return the truck by driving it through that door right there. They ended up putting an engine in it.
Ironically, about two years later I'm driving home and notice some dude on my ass. Turned into a convenience store with him following. Walking in with him behind me I hear a "hey". The conversation was as follows.
Did you buy that truck from...
Yes
That's my old truck. Has it given you any problems?
Me, no but the dealer had to put an engine in it.
Yeah it started burning a bunch of oil and fouling the #4 plug so I just traded it in.