I know this thread is for VX's, but I'm pretty sure there have been just as many Troopers (and possibly Rodeos) with the same engine problem.
Besides, 6 out of around 4500 in the US... 6 that we know of (from people on this thread). There are many other VX owners out there, so who knows how many other engine failures... plus the other Trooper and Rodeo owners, or course.
Not to put more of a negative spin on this. I have a '99 and have had no engine problems (yet).