I question the wisdom of having open slits in the valve cover for all kinds of road grime to get into your engine and then filtering only 15% of the oil. GM evolved and we are too.
The more closed and looped your system is, the better. Full flow filtering, PCV, and a breather cap on the valve cover is the best chance we have of not paying mega-bucks for another premature engine rebuild. Not sure why anyone even uses a bypass filter. Which 15% of the oil is it filtering? Better than nothing, but only 15% better than nothing. We have a great mod that one of our Bolters did that needs to be done at machine shop time here:
http://devestechnet.com/Home/FullFlowOilThere will be an entire overhaul of this page in the next few weeks to add more goodies including a few bypass spin-on filter solutions (of course as always you can build yourself). Stay tuned.
