I was reading a while back about a test in which they had two identical (brand new) Nissan Maximas. In one they put standard 10w30 oil and changed it every 3000 miles. In the other they put Mobile One Tri Synthetic (this was the ONLY oil ever put in the motor) and ran it under the same driving conditions for (get this) 60,000 miles. At the 60,000 mile mark both engines were disassembled and examined.... Which one do you think had less wear... that's right kiddos, the one with 60,000 mile old Tri Synthetic in it. Yeah, it matters what kind of oil you use. I'll try and locate that article and post it on here when I get a chance.

Adam