Expect some vastly different answers here, If you stick with the Honda recommendation and don't abuse the engine by overreving it you shouldn't have any problem.How often do I need to do an oil change
You can use fully synthetic oil. Use bike oil, do not use car oil.Will fully synthetic cause clutch slip on these engines? Iive always been told to use semi synth when the clutch is fed from the same oil as the gearbox etc.
Your wife's car also isn't run at full throttle for 2-3 hours a day with a constant supply of clutch dumps to do wheelies. I'll plan to change mine early and often given the abuse I intend to give it. In general though, you are right. Honda gives oil change specs that they are willing to warranty the bike with. This means for general usage they expect their recommendations to be conservative enough to not cause any issues. If you ride hard, in the heat, idle a lot, offroad a bunch, and do tons of wheelies then you'll need to change much more often. If you spend most of your time cruising at 30-45mph and never sit at stoplights and always accelerate softly then you can extend your oil change interval and not worry about engine damage.Hey guys, I think we can put more stock in Honda's oil change interval. The oil we get today is not your grandfather's oil. It is vastly improved! Even non-synthetic is extremely good.
People say to change the oil on small engines often because they seem to have so little oil. Actually, the Grom holds a lot of oil. If you compare how much oil the engine holds compared to the cc's, it is a lot. If my wife's car had the equivalent of the Grom, my wife's car (1.5 liter 4 cylinder) would need 3 gallons of oil at oil change (the car holds something like 3.4 quarts.)
My CBR250 has an 8,000 mile oil change interval! It is water cooled, so I think it is much easier on oil than a air cooled Grom. If my water cooled CBR can handle 8,000 mile oil changes, it should be conservative for the air cooled Grom to require 2,500 mile oil changes.
Over many years, we have been fed a constant stream of message advocating of 3,000 mile oil changes, with the implication that frequent oil changes will make our engines last a very long time. In the past, there was truth to this, but modern engines run better, and the oil we use today is vastly superior.