One problem related to coolant leaking has been reported for the 2008 Honda Pilot. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Honda Pilot based on all problems reported for the 2008 Pilot.
In December 2012 while traveling approx 70mph on a highway, my Pilot began bucking, and fitting back & forth. I was able to drive it to the dealership where they had to disassemble the engine, and determined the #5 plug had come off, and was rattling around damaging the inside of the engine. The dealership replaced the engine block, cylinders, etc at a cost of $9000. It was about 2-3k over the warranty, and past warranty by 2 months. Honda paid 90% of the bill, and I paid 10%. Today. . . Very similar experience, except this time it's leaking a coffee looking liquid. Assuming oil mixed with coolant. . . Still waiting to hear from dealership as to cause of leaking fluid, and appearance of mixed fluid.