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I love the feel of the acceleration when I press down on the gas in my 540 in sport mode but still on your first tank of gas is crazy. I guess it's true, we're all going to be driving electric cars some day soon.
BMW says 1 year and yes synthetic doesn't breakdown or absorb moisture like regular oils but it's a expensive car so imho I would just chance it every January. I'm not a BMW mechanic but I would think it would be good to force the gas engine to run once a month just to get the oil to lubricate the parts. Gas on the other hand does go bad from just sitting there so maybe a good idea to add stabilizers to it like Sea Foam.
Maybe good questions for service department.
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