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Great post excellent work... Just a precaution.... Stay as far away as you can from brillow pads, scotch brite pads etc if your going to clean anything intake or engine related, head etc. The bearings in our cars are hardened and do not embed particles in them. Older bearings had large amount of lead in them to help aid in contamination, new engines due to the pressures and environmental laws cannot. Thus the reason european 3 series diesels use a different bearing set up than n.a. Scotch brite pads work great however they do break down. I have seen a few industrial cummins engine come through my shop for warranty get rejected due to oil contamination/damage from scotch brite pads. Guys will send the engine to a local shop "no problem we can rebuild it for way less than the dealer" less than 5k on the engine total failure.
I will be doing this procedure in the spring however I am pretty sure I will send the intake out for ultra sound cleaning and purchase the walnut blaster kit just to be sure... There is a reason bmw recommends this procedure over others.
Great write up!
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