My 2002 Honda Accord LX just hit 80,000 miles about 6 weeks after I purchased it (used of course). I would like to make the switch over to Synthetic from conventional motor oil. I have always been told not to do this after a certain mileage, but the actual cut-off changes based on who I talk to. My last Honda (2001 Civic EX) was switched second day I had it at 75,000 miles. Just wondering since you all own Honda's and such, Feel free to chime in with your two cents.