I just did my 1st oil change after the rebuild on my 502's with Prochargers. It has been 10 hrs. plus with mineral oil 20-50. I just changed to Mobil 1 15-50. I did not use the same filter the mechanic used because it was the short type. It has been a while since I did an oil change and I swear last yr. I used Fram PH-13. I bought a pair of Wix filters from Car Quest # 85061, crossed from Fram. They are installed and I ran motors. Both pressures read normal but I just want to be sure these are the right filters.