I get what you say, but that's a tad broad and simplistic. 3000 miles in 4 months, yeah makes no sense but what if you drive 1500 miles per year on Sundays only. That's a two year interval...there is science for changing it then. I totally get your point but we just can't forget the intervals are a combination of miles, time and operating conditions.The 3,000 mile oil change was invented by Jiffy Lube to increase their revenues. No science behind it whatsoever.