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    Frequently Asked Questions

    Q. What is a Core Charge?

    A. A core charge is a deposit you will pay until the manufacturer receives your old part. If you don't have the core at the time of purchase, you must pay the core charge. Some manufacturers will refurbish or rebuild the part you send back for their next customer. The core charge is refunded back to you once you return the core. The customer is responsible for the shipping of the core charge unless a return label is included by the manufacturer.

    Q. Why did my 11-19 Duramax CAT Oil filter adapter not include a removal tool?

    A. You can easily remove your factory oil filter nipple using a 15/16” deep well socket on the 11-19 trucks. Only 01-10 trucks require the tool as the design of the factory oil filter nipple is different.

    Q. How do I contact MDDP?

    A. Whether you are looking for product support or order help, you can call us at 724-679-0094 or email us at and we would be glad to assist you. Our hours of operation are Monday-Friday 9:00 AM – 5:00PM EST.