I just sold a 70,000 mile 2007 CX7 DI turbo and the engine has never had a problem with intake valves loading up. The day I sold it, it ran from idle to the red line without any hesitation and never had a CEL, except, during the first 200 miles (HP fuel pump). I tried to pick an oil with a lower than most evaporation value (NOACK), and ended up with 5w30 PP and used 6K oil changes. Several UOAs demonstrated that this was a good OCI and could have gone out to the 7,500 max quite easley but, I do my own so 6 K is a nice number. My new CX5 will probably get the recomended (in the US & CAN) 0w20 or maybe the 5w30 which is the recomended oil outside of CRAF
). ED