1) use the HONDA OEM filter Shorty is fine, if it wasn't Honda would not have approved it for use on the motor. Considering that 2004, and 2005 models are still under factory warranty.
WE CAN BE SURE that honda does not want to replace an NSX motor, due to build up by one of their NEW filters
2) USE a GOOD fully synthetic oil (MOBIL 1 (prefferably), Pennzoil, etc)
And if you still are nervous,
3) Change the oil more often- our manuals show that a scheduled oil change should be every 7,000 miles. Personally I change mine every 2500 because its easy to remember 2500m, 5000m, 7500m, 10,000m, then 12,500 15000 (seea pattern?????) nice even round number-
3000 is easy to miss. 3, 6, 9, 12 , 15, 18, 21 ( not repeatable but if not rocket science)
"How Sludge is Prevented
Additive in the detergent oils 'wash' any contaminant particles off of internal engine parts and hold these particles in suspension until the oil is changed. It's important to understand that these particles are too small to cause engine wear, but they do turn the oil a darker color. The key thing is to change the oil before the oil becomes too saturated with contaminants to hold any more, but color is not an indication of this condition."
^^quote from site below
Here is a good short website to read through for everyone
pretty honest and non biased- even gives a review on filters, and oils detergents etc.
http://www.nordicgroup.us/oil.htm#How%20Sludge%20is%20Prevented
