Hey everyone. First post, but I've been lurking around for a while now. So, I have 2009 VW City Jetta with the 2.0L 4cyl engine. Manual says that I should change my oil every 15,000km or every year. The one year mark came up and I changed the oil at around 11,000km (GC 0w30). The car never sees the highway (500km a year at the very most) and all my driving is city driving with lots of idling and my trips are very short. Since I do so much city driving, should I shorten my OCI, or should I just continue my yearly oil change?