im running amsoil 10-30 as of right now, but switching to brad penn soon. and yes mobile 1 takes out zinc and phosphates for edmissions and saving catylitic converters, which none of us run, the mobile 1 zinc levels are low 800 and phos. 900, vs the others
brad penn zinc 1565 phos 1332
amsoil 1378 1265
royal purp 1200 1000
vr1 1400 1300.
and can i add that the brad penn is only 5.99 a qt$