I didn't see much proof here that people are into changing their own oil, but as my first new car I was curious to see what the oil looked like after 3500 easy miles. Especially considering the oil dilution issues they've had in the past. This was my first encounter with the aluminum crush washer that Honda uses on the drain plug to prevent over-tightening and ensure a good seal. I didn't notice it was their until I emptied my drain pan into a local trout stream and saw it there. Good news is, the new surfaces sealed and no leaks. But something to watch for. Honda part number 94109-14000 if it gets lost.