[Wil Ferch]

The problem, if we are honest with ourselves...is this--->

We say ( and repeat) things like ("change every 3000 miles"), because we've been conditioned and have experience doing this...and all seems fine in the end...no disasters...and the cars we speak of doing this to, last 100,000+ miles. The real problem is that we don't approach this in a scientific way...and we really can't...because it would take a "controlled case study", with at least 2 equal vehicles and running one car to destruction as we experiment with other things like vastly extended oil change intervals. We're not about to do that.

So...that leaves us proclaiming doing "X" as a procedure, and not having any duplicate cars going thru a controlled test with alternate intervals to truly judge.

Then there's this---> we say do "X" ( like change every 3000 miles) and we proclaim victory when a car'e engine goes maybe 100,000 or 200,000 miles without problems. How do we know that this is "good"? What if high-focus on extreme filtration , lengthened oil change intervals, and oil analysis done in-between....results in a "normal" 500,000 mile life engine?. How would we know?

If you follow some of the oil-guys on this board ( and other boards catering to oil issue), I think you will find that they have experience and data that tends to suggest this is true.