My dealer uses Shell Helix(Q-power) 5w/40 full synthetic oli. Is there any reason I should ask for another oil? If so, what oil do you recoomend and why is it better than Shell? Shell oil has been used for oil changes over the past three years at the dealers recommendation. I do not know what was in the car when delivered new. It is a problem changing oil brands? The dealership also sells Ferrari's, so they may have other brands available for the Maserati. Should I insist on another brand?