I've gotten groups of 3 off eBay with free shipping for that, and they weren't chinese knockoffs either. Besides I change my oil once a year. I don't spend my life just aimlessly wandering around seeing how many times I can change my oil.
It is when you need it. I'm lucky to put on 7k miles a year. I've got no reasons to needlessly wear out a vehicle. Just the daily chores around the house, and the shop keep me entertained all day.
