I'm looking to bring in a F10 523i but found out that Asian ones come standard with a 2.5l engine. The global one (3.0l engine) specs are fine, but the specs on the 2.5l looks a bit anemic. Worst of all is that BMW Germany, which I'm dealing with, says that they have only one global price for the 523i. If its to be exported to Malaysia, then it gets a 2.5l by default, with no discounts compared to the 3.0l global version, plus the 2.5l engine is an older one as well. Really pisses me off. Looking further, I found the F10 520d - its cheaper with better performance. Beats the 523i Auto (Asian spec) by half a second on 0-100 and a full second on 80 - 120. BMW confirmed that the 520d motor will not be derated for Asian spec cars. (Common rail pressure may be lowered but particulate filter will be removed, so no net change in performance)The only drawback is that its a 4cyl and probably rattles rather than hums. I've never had a diesel before, let alone driven one. Since the F10 520d will only be rolling off the lines later this month, the only feedback I can draw is from any E60 520d owners. I know that the torque band is narrower on diesels, but BMW still uses the same transmission as petrol engines. Does anyone have any driving experience on the E60 520d on noise level & vibration (in cabin) as well as how well the transmissions are mated to the engines, any gaps in power delivery etc?Thanks