During operating temp its a charm, vac is 25…boosts and holds 7psi fine, running 5w30 mobil1…no leaks and the im running NGK’s that were on my old motor which ran fine. Never had a tune up at a shop…i just keep it maintained as best as i can…the more i swap from the good motor the more i think its the motor itself…all the accessories were off my old motor/setup…which ran smooth as butter.