Store Credit is applied to your order during checkout. Upon reaching the payment screen during the checkout process, you'll see an empty field under your subtotal to add your customer credit. Your customer credit doesn't expire! Related articles How long does it to get my credit/refund after you get my return? How does the store credit on my account work? Can I return used oil under the Lifetime Replacement Guarantee? What if I buy oil but my car burns or leaks oil? Am I still refunded for all the oil? Does FCP Euro sell gift cards?