Originally Posted by bnuk
A good rule of thumb is to think what happens if that part breaks i.e.:
PCV valve breaks, you buy a new one, no biggie. go aftermarket.
Timing belt breaks, chances are your engine is shot. Go OEM
Good way to look at it. I am doing my 90k pretty soon. I went with 90% all OEM parts. I did it because it was easier for me to place an entire order at one place.