With the newer DI gasoline engines, there are a few things you should be doing.
From a good authority, this is what I have been advised.
1. Use a Top Tier fuel with a good amount of detergents. Then in addition to this you should probably be running something like the Techron Fuel Additive (or something that has similar ingredents) every 4th fill up. The DI injectors are in a far more harsh environment and are subject to carbon and fuel deposit buildup due to the heat and pressures the injectors are subjected to. Buildup on the injectors can and will impact the fuel delivery and spray pattern on DI engines, this leads to all sorts of issues in the long term. On older port fuel injection engines, this was not nearly as much of an issue.
2. On moden DI engines, highly suggest running a catch can. This will help reduce, but may not eliminate carbon build up on the back of the intake valves. There are a number quality catch cans available from vendors such as JL and K&N for typically around $150 and others are available even cheaper, but often you can get the system with the correct length hoses with quick connects and mouting brackets to make the installaton quick and easy. Worth the small investment IMHO. Just remember to check the catch can at least every 1000-1500 miles until you get a feel for how often is needs to be emptied.
3. Check your engine oil level every few fill ups, especially in the colder weather as fuel diluction can and will cause higher oil consumption. If you remote start your engine, or want to allow it to idle and warm up, be forwarned, this can cause a much higher amount of fuel to contaminate the engine oil as compared to starting the engine and driving the vehicle.
4. Change your oil when your OLM hits 25% or earlier, stretching out the oil change interveal in modern DI engines is not a wise idea. Whom ever came up with the 15,000 mile oils and filters is really screwing anyone that follows this lead. If you plan on running oil this long, get an oil sampler to pull oil for anaysis, but when the oil analysis is close to $40, you might as well just change the oil and filter, it is not much more than oil anaylsis if if you perform your own oil changes and shop around for sales and deals on oil and filters.
