Have Questions?
Professional-grade parts used trackside.
Expert help during business hours.
Encrypted checkout & trusted payments.
Orders ship quickly from regional warehouses.
The Ultimate DEF Cleaner and Anti-Crystallization Diesel Additive Reducing DEF Consumption
Bardahl DEF-Shot 3350 is a professional-grade diesel exhaust fluid additive formulated to eliminate crystallization and deposits within the DEF system. This specialized treatment restores injector performance, enhances engine efficiency, and helps reduce DEF consumption. By maintaining clean system components—including the DEF tank, pump, heater, lines, and mixer—it prevents costly repairs and ensures reliable performance in modern diesel engines equipped with SCR (Selective Catalytic Reduction) systems. Bardahl’s advanced chemistry supports smoother operation and optimal DEF dosing for consistent emissions compliance and fuel economy.
How to Use:
Add one 5oz bottle to a DEF cube or jug prior to filling the DEF tank. One 32oz bottle treats up to 16 gallons of DEF. Do not use in fuel tanks. Dispose of any used or unused solution in accordance with local, state, and federal regulations.
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
