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Your motor will be fine. I work in the Aviation world and ive seen bone heads put hydraulic fluid in jet turbine engines! And let me tell you this is not a good thing much worse than haveing 5w-30 in your M3. All that is required is a drain and flush if you contaminate the oil system. So don't worry 5w-30 use to be the standard fill on ///M engines. So i would have the dealer change the oil with the proper stuff 10W-60. Demand they give you 9 literes of 10W-60 and a filter and seals. Take it for a drive get the oil up to operating temperture and change it yourself or talk the dealer into flushing your system for you! and all will be good no worries.
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