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Maybe the turbo line isn't even leaking and maybe it's the valve cover gasket? I would definitely go to an independent shop that works on BMWs. Everything else quotes, don't even bother. If you change your oil around 7.5k miles, then you won't need an engine flush. Same with the fuel injector flush, just drive it hard every now and then. Microfiber is a 15 minute job with no special tools and the filter itself is around $25 in fcpeuro if I remember correctly.
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