If a Valero credit card is lost or stolen, it is important to act quickly to protect your account and personal information. First, the cardholder should monitor their account for any unauthorized transactions. Next, it is advisable to report the loss or theft to the Valero Credit Service Center as soon as possible. This can often be done through the customer service section of the Valero website, where you can find necessary contact information. In most cases, the cardholder can request to have their card suspended or canceled, preventing any further misuse. Following this, the cardholder should also ask for a replacement card, which will typically be issued and mailed to their registered address. Additionally, reviewing the account statements regularly for any suspicious activity is a good preventive measure for the future. Remember to keep the contact information for the Valero Credit Service Center handy for any future inquiries.