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Oil draining over the hot exhaust? Sounds good guys, let's sign it off and start production!
(files.catbox.moe)
This is a community for designs specifically crafted to make the experience worse for the user. This can be due to greed, apathy, laziness or just downright scumbaggery.
All fire needs is heat, oxygen, and fuel. You've got all of that there.
The exhaust gets hot enough to burn off oil when it's idling, so I'm sure it's hot enough to burn cardboard.
I'm not going to risk it, the tinfoil idea sounds like the goer here.
Are you doing your oil change with the engine running or something?
No, it won't make cardboard catch on fire, just like the oil on it won't catch on fire if you left it there.