A&Q about 350Z
Q:
I'd just put a pile of thermite on the hood, no need to open anything.
A:
Well if it stayed granular I can't imagine how it would get into the bearing surfaces, altough if it was picked it up by the oil pick up, and by passed the filter, it could block an oil passage way.
A:
bleach in the gas tank will kill the engine though, i don't remember exactly what it does but it rusts out the gas tank really badly. they showed it on myth busters.
another thing, if you notice your oil pressure gauge going down, then you know he loosened something. keep an eye on that if you think he's going to do something like that.
all in all though, i wouldn't worry about it, so many people say they're going to do stuff, he'll pussy out just like the other 9/10 people.
A:
Just callin 'em how I see 'em man. And what I saw was a very damaged 2JZ with sugar in the oilpan.