CKD AND CBU different? I am looking to purchase a 520d but not sure the different between the different of local CKD and imported cbu Quick look at the internet suggest that the 2l diesel engine of bmw, n47, has quite popular problem of timing chain problem. And it's difficult to change because need to dismantle the gearbox/transmission It's common to happen to have timing chain failure? How much does it cost to have egr + swirl flap delete? Does it have cat exhaust or just muffler only? If remove cat/dpf, require to remap? How much it costs? And cost to change timing belt before breakdown. What about its 8 speed transmission? Reliable? Single and twin turbo, got twin turbo failure? And the maintenance cost, can the engine runs on semi synthetic engine oil? Another alternative is e300 mercedes hybrid diesel. Can the hybrid convert to normal aircon pump?