In USA/Canada, change oil every 6 months is still recommended. Oil is cheap there, $25 already good like Mobil1. In Europe, oil and gasoline cost 2.5x more, once a year in spring/April is sufficient. Oil usually get thinner over time and the wear and TBN dropped is less in summer. In most case, the condition of ACEA standard oil is still good after 10k+miles, some longlife oil are actually 2 years OCI rating. So far, it works fine in my brother Toyota Auris. At 120k miles 2010 1.8L hybrid (notorious for burning oil like Prius 2010-2013), only burn 1L per year/10k miles with Toyota 0w-20. My 2015 Auris hybrid 1.8L with similar engines but redesign piston rings and piston has negligible oil consumption in 10k miles OCI at 70k miles now. However, almost all VW Golf my colleagues have, burn some oil. From 1.4TSI to GTI 2.0 TFSI, they all burning oil at least 1 L between OCI since they are new. Something to do with the built quality of the engines. The 1.8L is wellknown to have very low wear sonce 2003, although some certain year especially in Prius 2010-2013 is sensitive to OCI and oil type