Read the manual. Changing the oil too soon is not helpful. modern oils often give the least wear at 8000 miles (the longest chain moleculs break down and that is accounted for by making the longer than needed.
if you really want the engine to last install a bypass filter use 25k mile oil and then do an oil analisys every 10k miles when you replace the filters - only changa oil when the lab says so. the lab will charge more than the cost of an oil change which is why almost nobody does this.
for most of us the engine will out last the gest of the car with just regular oil changes so this above is not useful advice.