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Help Center

Welcome to Sinister Diesel's Help Center! We're here to assist you—please select the option that best fits your needs. Our customer service team is available Monday through Friday, from 8:00 AM to 5:00 PM (PST). While we strive to respond to new tickets as quickly as possible during these hours, in rare cases, it may take up to 24 hours to receive a response. Most tickets are addressed via phone, so keep an eye out for a call from a 916 area code. If you use any call-blocking apps or have a non-contact phone blocker, please adjust your settings to ensure you don’t miss our call. Thank you for choosing Sinister Diesel!

Copyright 2025 Sinister Mfg. Company, Inc.. Not responsible for errors or omissions anywhere on this website . Sinister Diesel reserves right to modify, change or cancel any offer before, during and/or after any sale or transaction. Sinister Diesel ®. Copyright 2021.Sinister Diesel ®, Sinister ®, Sinister Blue ®, the color blue, Master Solution ®, Basic Solution ®, Complete Solution ®, American Born and Bred ®, Unleash Your Truck ®, Pitbull Series ®, Undelete Kit ®, Undelete Your Truck ®, Undelete My Truck ®, the Sinister Diesel logo, Spooled Up ® and all related names, product, designs and slogans, service marks, trade names, and trade dress, whether registered or unregistered that appear on this Website are proprietary to Sinister Diesel its affiliates, its licensors or their respective owners. All Rights Reserved.