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Prestone Command DEF is formulated with high quality urea and demineralized water to work with ALL SCR-equipped diesel engines. Prestone Command DEF is a safe, easy-to-handle nontoxic solution of 67.5% water and 32.5% automotive grade urea. It is a stable fluid that is colorless and odorless. Diesel Exhaust Fluid (DEF) is a consumable and essential fluid for maintaining Selective Catalytic Reduction (SCR)-equipped modern diesel engines. SCR allows the engine manufacturer to tune the engine for increased fuel efficiency while remaining in compliance with Federal emissions requirements.
Prestone Command DEF usage will vary by vehicle. Most OEMs estimate usage will be 2-3% of diesel fuel consumption. On average, this amounts to one gallon of DEF to every 50-75 gallons of fuel. Check owner’s manual for proper usage in your vehicle. DEF reacts with certain metals such as aluminum, copper, and brass. Therefore, only place DEF in storage tanks and dispensing equipment made of stainless steel or high density polyethylene.
Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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