I am gonna do an extended OCI for my Hyundai Veracruz. Hyundai recommends a 7k OCI. Im not too terribly comfortable going 7k. Call me old school. But, will there be any benefit to changing out the oil filter and topping off about half-way through the OCI? Say at around 3.5k? I'm using PP 5w-30. Or am I wasting money and resources.