Just bought a 2006 Supra 24V w/8.1 with 130hrs. and trying to find out best practices to keep it running strong. Oil - Pennzoil 40w suggested by Indmar or Synthetic -which weight? Cleaned the K&N air filter 59-5005 but is there anything larger? Bought the AC Delco spark plugs and wondering if its worth replacing the ignition wires? Thanks for any wisdom you can share.