Trying to see if there is any correlation between maintenance history and blown headgaskets. If you had a blown headgasket -and only then- you may vote. Nobody else please. Pick the closest description of your maintenance history and condition at time of blow up. When it blew means that very day Long-term maintenance history means over the life of the engine or at least many thousands of miles before blow up. Good condition means a cruiserhead maintenance, serious flushings at frequent intervals, periodic checks, replacement of parts as PM etc Average condition means per Toyota specs, no particular care but reasonable flushes and repair. Poor condition means there was something wrong: sludge, mixed or old coolants, defective parts etc.