GM Parts Online does not specifically mention a customer loyalty program at this time. However, many online parts retailers often have various promotions or discounts available that can help customers save on their purchases over time. It is advisable to check their current web page for any special offers, promotions, or discount opportunities that may be available. Additionally, they may provide newsletters or email updates which could feature exclusive deals or upcoming sales. If you are a frequent customer, it may also be beneficial to keep an eye on various automotive forums or their social media channels for any announcements related to loyalty incentives. Always reviewing the website can ensure that you do not miss out on potential savings.