Uhh.....nitroglycerin ? 
Maybe just jam something so it's at wide open throttle and just wait and see
how long until something gives out. 
It's not  vanagon question though. 

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Andrew Grebneff
Sent: Thursday, November 29, 2007 12:18 AM
To: vanagon@GERRY.VANAGON.COM
Subject: What in fuel can wreck engine?

What can I put in the fuel of a car to make the engine fail quickly?
It's a Mazda EFI 1.6 Familia (323) engine.

Don't say sugar, please.

Engine-blows can be such fun!