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MON - FRI: 9:00AM - 5:30PM (EST)
SAT: 9:00AM - 3:00PM (EST)
Dirven's Carb Defender™ Fuel Additive is specifically formulated to protect against Ethanol corrosion and induction deposits. Special corrosion inhibitors work to prevent expensive repairs and diminished performance caused by Ethanol-blended pump gasoline and the moisture it attracts. High levels of Ethanol dilution in the motor oil can also lead to rust and other corrosion problems in the crankcase. This new additive, however, controls combustion chamber residue, plus cleans and protects surfaces of the fuel system and intake tract. The additive treats up to 25 Gallon of Ethanol-blended gas, and should be used with each and every fill-up. Driven Racing Oil™ Carb Defender™ Fuel Additive keeps the carburetor functioning properly and is designed for the unique needs of classic vehicles that spend much of their lives in storage between cruises and special events.
Features & BenefitsBuy with confidence If you encounter any issues with your product, simply reach out to us. We are committed to ensuring your satisfaction and will assist with any return or exchange requests that meet our policy guidelines.
We assure you that we ship all the parcels received on the same day till 12 pm standard central time.
We send shipment tracking numbers via email. It is sent to the email address you provided in your order. If you would like to change the email address you provided, Feel free to contact our support team at (support@part-synergy.com).
We are here to serve you. If there is any item that is damaged or needs to be exchanged or returned for any reason, please contact our support team(support@part-synergy.com). Please read our return and exchange policy to learn more about this.
All orders are free of shipment costs. The cost mentioned on the website is for getting it to your doorstep.
Please do get in touch with our customer support as they may be able to provide you with a return label which will cost you much less. But if you still need to send an item back, here is our shipping address.

| 1 Day | 2 Days | 3 Days | 4 Days | 5 Days | 6 Days | 7+ Days | |
|---|---|---|---|---|---|---|---|
| If Picked Up On | Will be delivered by | ||||||
| Monday | Tue | Wed | Thu | Fri | Mon@ | Tue@ | Wed= |
| Tuesday | Wed | Thu | Fri | Mon | Tue@ | Wed@ | Thu= |
| Wednesday | Thu | Fri | Sat | Tue | Wed@ | Thu@ | Fri= |
| Thursday | Fri | Sat | Sun^ | Wed | Thu@ | Fri@ | Mon= |
| Friday | Sat | Sun^ | Mon | Thu | Fri@ | Mon@ | Tue= |
| Saturday | Tue* | Wed | Thu | Fri | Mon@ | Tue@ | Wed= |
| Sunday | Tue** | Wed | Thu | Fri | Mon@ | Tue@ | Wed= |
*Sunday^ delivery if the shipper is enrolled in weekend spotted trailer pickups
**Monday delivery if the shipper is enrolled in weekend spotted trailer pickups
^Monday if not a Sunday eligible ZIP code
@ The following week
= Earliest possible delivery the following week
This map illustrates service schedules in business days as of April 2022 for FedEx Home Delivery shipments
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The Service Maps and charts are a general representations of transit. For more accurate transit quotes visit Shipping Rates and Delivery Times on fedex.com
Please Note: Packages picked up from a residence may have one additional transit day. For faster returns please drop off at a staffed FedEx location.