Oh and as for the "change every 3K" ... I prefer hours as a meter (offroading has many hours, fewer miles). I do a twice a year on most of my vehicles (DD perhaps 3).
Just a data point ... my wifes car is now 2 years old has only 6K miles, but I've done the oil three times (and about due for another). Why so many you ask? Well, it is a turbo for one, but mainly it does many short trips and we live down a dusty road. So, even tho the miles are low, it has many hours. A DD sedan I had got 12K per year, and got changes every 6K (even then oil was "clean").