You are free to experiment by changing just the filter at 5000 mile intervals and topping off the oil but I don’t have any real statistics to offer except that Castrol seems to be really proud of that oil and had a great infomercial without that shouting buffoon that you see everywhere now.They didn’t bless it with a bishop but I don’t think you will be rooked no matter what you decide to do. I always wish that other people would do the experimenting while I change it every 3000 miles like my owner’s manual recommends for the GMC 4.8. In the winter, I have a service station do my oil change and lube and they use Kendall oil, non-synthetic. I let the Toyota dealer change the oil on the Yaris and I don’t bother asking what oil they use. I have only lost the engines that were ran without oil.