I do my yearly oil change 2011 RAV4 (2.5 4-cyl) every fall. I use whatever synthetic 0 or 5W20 is on sale. There is Quaker State UD 5W20 in the sump right now, changed October 2017. This vehicle is driven only a few thousand kms per year, and I've put around 2500kms on the oil. Winter seems to have hit rather early this year, and I was wondering if I should just stretch the OCI until the upcoming spring? That would stretch out the OCI for 1.5 years, something I have never done on this vehicle before.