u can try penzoill 10w40 if u always travell long distance...if ur juz a regular weekend car u can try the 5w40 fully synthetic,more respond & light for the engine.
i have increase my 4g93t to 1 bar boost and tune it with e-manage. Now, if i down boost it to 0.6 bar, but dont tune my e-manage back, what will happen? engine running super-rich? or e-manage will adjust accordingly...