[f5fstop]

Never heard of True Flow, so can't comment.
Shipbldr brought up something that I forgot to mention...oil analysis. There are companies that will analyze your oil and that will tell you how dirty it is for foreign particles, as well as how the total base number is for the oil life.
Serves two purposes, lets you know if your filter is filtering ok, and lets you know the estimated life left on your oil.