So we have opinions that the first oil change falls between 500 and 7,500 miles. In addition we have the owners manual with has a 5,000 or 7,500 mile OC listed depending on driving conditions. How about this idea:7,500-500/2=3,500/2= 1,750 +500=2,250miles and 7,500 -5,000=2500/2=1250+5000=6,250 OCI. If we average the result of opinion & the mauual we get 6,250+2,250/2=4,250 miles. I think I'll stick with my 2500 mile first OCI but, to each his own. I quit this thread now but, the exercise and dialog was great for awhile.. Ed