Really depends on maintenance. I'd say if regular maintenance was done by Honda technicicans, 250,000+ miles. If nothing more than necessary maintenance and oil/filter changes were done, I'd say 200,000 miles. It it was beaten to hell, 150,000 miles. This is before the engine requires major mantenance, not when it dies.

This is based on minimal experience with high mileage J30's...anyone have experience with it? I only have experience with a couple 100,000 miles J30's that feel brand new and a few 250,000 miles Honda 4 bangers.