Is Ester or POA? One is Group 5 and one is Group 4 or do you mean mix?I'm going to be testing Penrite from Aussieland this Friday. Video-ing the whole thing too cuz they claim that the oil will quieten any engine and give superior protection. Also, it's 100% ester/pao base oil too, not just any old mix
If want a quiet engine try looking for ER (Energy Release) Metal Conditioner. Tried before at mechanic there. Warm wira engine up, set the tappets run engine again still got tik, tik tappet sound. Pour in ER rev to 4k RPM for one minute, then let idle, no more sound....