No matter what kind of oil you use, your filter will start losing efficiency within a week of normal driving. Why? Because it's doing its job FILTERING contaminants. And it can only filter so much! Modern engines have much tighter tolerances and you're just hurting yourself by exposing your mill to whatever grit, metals and soot is in there for longer than necessary.

All you over 3000 mile changers, at least change your filter at 3000 miles if you believe in your oil so much. All the oil does with those contaminants is SUSPEND them. They don't miraculously change to some magic inert material, they don't go away if the filter can't take anymore. When the oil reaches saturation it begins to sludge and does more harm than good, losing its ability to flow and dissipate heat effectively.

I spend about $30 at each oil change using Mobil-1 and a Mobil-1 Synthetic filter. I have a quart left over so it's like a "free" oil change on the sixth service. It takes me 30 minutes to do the job and any auto parts place takes the used oil. I drove 21,400 miles this past year which means I spent $210 on using the best possible materials to maintain my beloved VX. $210. Can you afford $210 a YEAR to keep your VehiCROSS in tip-top shape? If you can't, you need to look at giving your VX a better home.