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fuel dilution will increase the chances of lspi. it emulsifies the oil and with higher percentages of fuel in your oil, you will more likely have detonation events on the sidewall of the piston. that will lead to a blown motor since most likely it will break off the top of the piston.
most likely you have an injector that is leaking down through the cylinders and because BMW does not want to replace it they create BS stories on what is acceptable.
have the injectors replaced before significant damage occurs. a good/normal dilution should be less than 0.5 percent
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