What is the best all around conventional oil and filter? I currently run Super Tech oil and a Purolator filter, changed every 2000 miles. The Super Tech seems to cling pretty good, so I decided to start using it, 87 cent a quart isn't bad. If there are better conventional oils and filters out there, please tell me! I dont mind paying extra, but the Super Tech is SL rated as are many of the other good oils.