I change oil 2 times a year running Amsoil full synthetic. Oil costs 8$ per quart but is good for 12,000 miles. Check Amsoil.com.
Comp Orange Coswagon /Torsen and 4.06 gear, alum. flywheel/w/Centerforce clutch. 2.3L/ 11.6 pistons, 39lb. inj. Eagle rods, Stage 2 Cosworth cams on ported street head with the Cosworth Intake and exhaust, 205NA HP., rev limit 7800 rpm.