Originally Posted By: m6pwr
The question nobody seems to be asking is the "Why?". Why has BMW decided to make this change? The assumption seems to be that BMW is getting hosed with warranty claims due to oil-related failures. But there are a ton of pre-2014 BMWs out there that are still in warranty. According to BMW's SIB, they can safely go 15k oci's but the new ones can't? Why? Are the highways and byways of the U.S. littered with the carcasses of pre-2014 BMWs broken due to lube failure? For that matter, how about Europe?
As for "huge" sumps on BMWs, the sump on my '09 VW TDI diesel is 4.4 liters, so 7 liter BMW sumps look pretty big to me; and the sump on my '13 M3 is 9 liters. Compared to the TDI that gets my vote as huge.
The funny thing is that the factory oci on the TDI in Europe is 18.6k (30k klms), but 10k mi in the U.S. Same engine, same oil (VW 507). I believe the same disparity holds true for many of the other VW/Audi models, and even the Porsche and Mercedes cars. Wonder why? According to posts on the TDI forum, diesel TDIs in commercial service in Europe (e.g. taxis) can go 31k (50k klms) between oil changes. I remember seeing a used oil analysis posted by a euro owner of a TDI used in some kind of courier service. The oil was run to 29k miles (not klms) and the used oil analysis looked fine except for 127 ppm iron - - which is still within limits.
Neighbor, let me try to give you an answer

I am originally from Europe, and I still have VW tdi there (actually it is Skoda Octavia 1.9tdi).
Simply, it is fuel. Fuel in the States still containes much more sulfur then in the Europe. Exception in Europe would be Russia, Ukraine, Moldova or Belarus. Other countries have much better fuel. My brother until recently drove BMW E60 525d (197hp) and OCI was at 30k, LL-04 oil.
Second, in Europe cars develope on much less scale issues that are very often in the U.S. Fuel dillution in di engines is not that big of an issue (actually when I asked one mechanic there he gave me very strange look) because of small amount of sulfur and high speeds on the roads. Same goes with carbon build up. For example, I am coming from Bosnia, and between my city and capitol Sarajevo there is like 30-40min drive on superb highway on par with German autobhan. Suffice to say, Skoda octavia rarely sees below 100mph on that stretch of highway. Same goes for various DI gasoline engines that usually use roads like that for figuring out what is max speed and can it go higher then previous time.
The U.S. roads (although I would not call San Diego roads as "roads," maybe "an attempt to replicate roads") with strict speed limits are killing machines that are made for speed. Same goes with this fuel that is just horrible (CA being little better).
Anyway, I try to stay with gas stations like Shell, Chevron, and on occasion car goes and sees desert and max speed

(my way of fighting carbon issues).
So, BMW might figured out that new turbo engines have issues with fuel dillution or something like that.
Anyway, VW reccomends 10k OCI, I stay with 5k, using ONLY Castrol 0W30, and now since Amazon have again Pennzoil Ultra 5W40, I might use it in summer months.