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Question for Unleashed

Discussion in 'The Greasy Spoon' started by RedRocketMike, Nov 7, 2014.

  1. RedRocketMike

    RedRocketMike A Member Well Known Established Member

    Jan 18, 2007
    In August I filled up my CTS-V with Mobil 1 EP 10w30 (first time using it) and promptly road tripped about 4200 miles in a week, 8-16 hours at a time. Just flat steady cruising. I was not surprised but after returning the oil was still very clean, completely full, and had no gas smell like it normally would (cam). I'm wondering how you think that kind of driving extends what would be my "normal" service interval. Usually I change the oil around 6,000 miles, it's 1/2-2/3 quart low, and is composed mostly of 5-20 mile trips with frequent spirited driving when the oil temp crosses 150. I'm past 7,000 miles now and the oil is still looking great. I feel like that 4,200 miles might be the equivalent of about 1500 of my regular miles. All the steady driving across a mostly flat states, very little load, very few restarts. Has to be easy on the additive package.
    Last edited: Nov 7, 2014
  2. UnleashedBeast

    UnleashedBeast Engine Lubrication Guru Established Member

    Oct 20, 2010
    Pensacola, Florida
    The lubricant in question is capable of up to 15,000 miles or one year, per Mobil 1's specifications of the base oil. However, I'd cap it at 10,000 miles or one year, whichever occur first. When on the interstate, the engine rpm is constant, very easy on the lubricant. With that use, it's very possible to achieve the rated 15,000 miles with that lubricant. My opinion is, if you do not drive this car more than 10,000 miles per year using EP 5W-20, only change the lubricant once a year. There is no point in wasting it with highway miles.

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