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#21: 04-22-2008, 03:13 PM
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Location: CT
Car: '15 Legacy 2.5 Ltd Eyesight Carbide Grey
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Do you think it is really the best idea to start changing oil grades? If you don't like Mobil1 5w-30, then you switch to mobil1 0w-40 because it's a better formula? What about a different brand 5w-30? From all of the articles I have read where the experts are speaking about oil, I can't recall a single one that doesn't practically have in bold letter, "Always use the factory recommended weight oil". Unless the car is being modified or something, I have enough faith in the engineers that they chose the appropriate weight oil for the car ahead of time regardless of warmer temps (TX, FL, AZ) or colder temps (MN, AK, ME).