Hi Scotty,i have S2 stagea, i do 20,000 pre oil change + i have been SAMPLING my oil,WESTRAC here in Perth do sample kit`s at $26. great price as i set up trend & see what is happening with my oil,i change Filter at 10,000, Nissan Filter aswell,there is some detail`s on my OIL SAMPLING,+ if you go with relocation filter you can Move it so it will be easyer to remove ,good luck Cheer`s Chuckie.