Congrats on your X5M. I've had mine for a few months now and have been replacing fluids and other items. While doing the plugs I suggest replacing the coils at the same time. If you're looking for longevity, as myself, heat is the enemy. Try to find ways to contain the heat...heat shields, turbo blankets, hose sleeves, etc... Emissions and performance don't really go together so I suggest having an oil catch can.
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