As the owner of an '06 4Runner with the 1GR-FE V6, I have been trying to keep up with the posted UOAs on this engine. It looks like these engines may have some issues - especially with elevated levels of lead. I believe fuel dilution is also an issue. The UOAs certainly don't look like what I would expect from a typical Toyota engine. I've read up a little bit, and it certainly appears as if Toyota did their homework on this relatively new engine and designed it for the long haul, but the UOAs say otherwise in some instances. I have less than 5K miles on the vehicle, so I will wait to have a UOA, and I will probably use Terry's services. I am just wondering whether anyone has a lot of trouble-free miles on this engine or some other comment to help ease my concern. Darn- I should've had a (4.7L) V8!