I have this stove that I got used, I've barely gotten it hot enough to cook food yet on our one trip out and first burn today, and it was a little warped when I got it too. I have no idea how old it is, but the top and bottom are a bit wavy. No corrosion at all, and I rubbed it down with cooking oil before storing, but I'm wondering if the warped top surface is concerning? I'm relatively new to winter camping still so I'm not sure what is considered acceptable. Should I plan on replacing this soon or let it rip? How banged up are y'alls stoves? Seems like the uneven surface effects heat transfer into pots and pans, and that's kind of annoying.