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Just changed my oil before a long trip to SoCal from NorCal. Went with BMW 0-30W for a little more protection in this warm weather. Granted my car only has 17K on it. Gas mileage improved by 1.5 mpg on the highway over dealer changed 0-20W, both measurements on all freeway driving (huh?) Thicker oil and better gas mileage. I love it.
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