[metroschultz]

Frank,
I don't have to change the filter. I could run 10k on the oil and filter and change them both at once. I came from the old, old school, where more often is better than the book calls for.

I got sold on synthetic oil after I had a car with noisy lifters. They wouldn't clean up no matter what ( engine flush, marvel mystery oil, etc ad nauseum).
Our Havoline Oil rep "Promised" me that their line of synthetics would quiet it right down. And they did.

I am at 10k oil change for my wifes car. After some oil analysis I learned that at 10k she still has plenty of lubricity in the oil and viscosity hasn't broken down measurably and there is no particulate matter and so on.
I change the filter, because I want to and it makes Me feel better. (kind of similar to Dos Equis)
(I sometimes still cringe when I think of a 10k oil change)
A filter is $3 and 5qt of synthetic is $30
I am still cheap.
I didn't mean to get so wordy but felt this info would be useful.
Schultz