Thank you for taking the time to share your feedback. We’re sorry to hear about your experience, and you’re correct that Mobil 1 5W-30 is not approved for use in a 2011 Volkswagen TDI. This product does not carry any Volkswagen or European vehicle specifications required for your engine. We’d be happy to help you find the right oil for your vehicle — please feel free to contact us at 1-800-ASK-MOBIL or 1-800-275-6624 for further support.