After a lot of research, I did this lil mod today. Total cost was about $22. The below link is a DIY on a QR25 motor, from a Nissan SpecV but it's the same steps for our 2.5's. It's basically preventing oil from going back into the intake manifold from the crankcase (PCV valve) therefore preventing sludge build up.
http://www.401motion.net/forum...=1769
