autozone B&M coupons $5 off $25, $15 off $50 expires 2/4/18

Autozone coupons: $5 off $25, $10 off $50, $15 off $50 and $15 off $75 in store use only.
Amounts seemed odd ($10 off $50 or $15 off$50) but they worked just fine multiple times
Used a couple on the Gumout fuel system cleaner sale.
Bar codes wouldn’t scan, but after I showed the cashier the instructions, they managed to enter the code. Strangely it shows up as $0 dollar promotional discount until totaled.
https://promotions.spredfast.com/…710831.png