Say you are about to head off toLog In for an oil change. Would you check their site (or maybe even an app) to see if there is some kind of discount or coupon first? There is for this brand, and I'm sure there are for many others as well. It's worth a look anyway, if you ask me. I'm not a big fan of apps, but I'll definitely check out their site. I might even sign up via email for other deals and discounts and offers (I have a spam email address set up just for this kind of thing, so my main email account doesn't get clogged with offers). Then, when I need something, I go have a look at that account and see if I have any good offers waiting. Why pay full when you don't have to?