Hi guys, i recently put more oil in my ep3 type r, as it was very low, i put castrol magnatec 10-40 in it, and it felt good, then i filled it right up to the high dot, it seems to run fine but vtec kicks in at about 6500 rpm, instead of ?5850? rpm, could that be the reason? or are there other reasons? I have an injen cold air intake and no other mods, ecu is standard.