How to secretly sabotage an engine

My roommate is a fucking cock right?
He just got a shiny new f150.
How do I fuck it up without getting caught?

Note: He knows his way around an engine WAY better than I do

You go back to /b/ you underage faggot.

Would they have better answers?

Buy a bottle of octane booster and pour it in his gas tank. His engine will break as soon as he turns his truck on.

civic for 3k

Would a mechanic be able to trace this?

Not if you wear a mask

Nope. Only do it if you REALLY want to cause a lot of damage. Octane booster is very dangerous.

Oh wait fuck you I know what that is. Sorry I'm retarded with rage right now.

Seriously OP, if that F150 has an ecoboost you'll blow it too the moon

Be careful.