Mobil 1 is my first choice for an OTC motor oil. I'll just have to change more frequently because the "severe" driving style my Accord sees has resulted in some light varnish in the valve train area with he OCI I was previously using. Last time I checked Mobil 1 Full Synthetic 0w40 still has some of the better base oils in the M1 line up, thus the reason I selected it for mu current OCI in an effort to do more cleaning without the expensive price tag of some of the higher end offerings.