I am a new member to the site and have to say that the information and resources you fellows provide are outstanding. My question is this: I have seen alot of information regarding the quality of Castrol, Pennzoil etc. but nothing on the Exxon, or here in Canada (Esso) oils. I have just purchased a Mazda 6 with a 3.0 L V6 and the recommended oil is 5W-20 and would like to use the best dino 5W-20 I can buy. Are the Exxon products worth a look or should I use one of the other brands.