Quote:
Originally Posted by Lloydy1980
There shouldn't be any rough parts in an M Engine, these are ultra precision made pieces of equipment, the purpose of a running in oil is that it is mineral based with zero additives, it is these additives (found in semi synthetic and fully synthetic oils) that are designed to prevent wear which you don't want in a running in (mineral) oil as this prevents the engine from bedding in properly. If you ran fully synthetic from the get go you'd end up with an engine that won't bed in properly resulting in poor piston ring sealing and increased blow by resulting in oil burn and power losses.
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There is no normal oil made that is so slick it stops modern ring sealing. The break-in oils in the past, and still today for engine builders of flat tappet V8s, is actually extra additives to stop cam lobe and tappet scuffing. In years past piston to wall clearances were tighter but vast improvements in piston technology and manufacturing have eliminated the need for tight initial fit and the risks of piton skirt scuff and failure. There were loads of reasons 50 years ago for break-in oil and brea-in drains of fluids. One of the biggies is that the engine did not have a determined vehicle when it was filled with oil in times past and break-in service was the chance to get the right viscosity in it for the climate (and years before, for the season when oils ere different for cold and warm ambient temps). The S motors have tight running clearances for crankshaft mains and rod bearings and BMW likely does use an enhanced additive package and an altered viscosity in these engines for initial starting and the multiple starts before it gets to dealer. It is never bad idea to do early drains, even if the ONLY thing it fixes is your peace of mind, as any metal or other debris can get out sooner. Magnets in drain plugs or transmission pans can be cleaned if accessed and that is also never a bad idea so that magnet can hold more as they lose hold power when there is accumulation. I worked for a car manufacturer (and before that, dealers) and did a few port visits where vehicles came off the ships. Your vehicle has been substantially broken in before it ever gets to a dealer. Most vehicles gets loaded and unloaded between many transporters before it gets to you. End of line to factory parking, parking to truck if the train line isn't on-site (not sure about which BMW plants have resident rail lines), truck to overseas shipping, offload from ship to port parking, port parking to port inspection and processing, processing back to outbound lot, lot to truck or train depending on the port and final destination, if by train then there is train offload to lot and then loading for truck and then finally it is at dealer. Not all those different handlers will be kind to the vehicles. The period between starts will be hours to weeks. The guys that off load ships often run into boat from lot shuttle tram and race to see who gets down ramp first. You most certainly do not get to pop the cherry on that ride when it gets to you, you are getting sloppy seconds.