http://www.noln.net/columns/9-05/features/intervals.htm
Snip" Remember the good old days? You know, back when keeping tabs of recommended oil change intervals on vehicles was easy. Back then, just about everyone stuck to a standard 3,000-mile oil change, regardless of driving conditions.
These days, it’s a bit more complicated. Actually, it’s a lot more complicated. It seems as if almost every automaker in the world decided to go with their own recommended maintenance intervals, leaving the automotive landscape a hodgepodge of recommendations guaranteed to befuddle just about anyone in the automotive service business. And let’s not even wonder how it confuses the driving public." Snip....