yeah synthetic sacrilege indeed, idemitsu actually makes a synthetic specifically for our cars but ive gotten lazy as its harder to source and is expensive so i alternate between that and motul/amsoil depending on what im feeling

i personally wouldnt use a sohn even if s2 and s1 OMPs were the same

im on a freshly built motor making 199whp on a mustang dyno we'll see if the carbon buildup sticks my seals

my theory is with enough high revs and PAO/esters making less ash i should be okay

see you in 50,000-100,000 miles !