Just checking on how Direct Injection(DI) engines are fairing at higher mileage (i.e. 100K) with respect to intake valve desposit issues ? ...Perhaps it may depend on the engine - but I am specifically interested in the Hyundai / Kia GDI engines and how they have generally faired over the last few years ? Lastly - does variable valve timing (Hyundai DI engine) play a role with a DI engine design to control intake valve deposits ? ...Thanks in advance for your replies .