Hmmm. I don't think you would have been able to use the explosives method where I saw this. It was on the nature strip in a suburban street!!
Fuel oil? That has me intrigued. Why?
Farmers mixed Nitropril and Diesel to blast stumps out for years before the industry took it up as the weapon of choice. You need the diesel as the thing to burn, the nitrous fertiliser is the accelerant, like adding nitrous oxide to your car engine.