So i was chopping up my 76 parts pickup to send to its doom when i got a brilliant idea to drain the nasty old sludge/fuel out of it and use it in the gravel around my house to kill the weeds. Holy baby jesus did it do the trick. They were wilted and curled up in like 30 mins!! I knew it was nasty stuff but WOW! So my advice,if u need a good weed killer,find an old oregon truck that has sat for 20+ years and snag whats in the gas tank!!