Castrol® TranSynd 668® is a premium full-synthetic automatic transmission fluid (ATF) specifically formulated for Allison Transmission® heavy-duty, on-highway automatic transmissions. Engineered to meet the latest Allison TES 668™ specification, this synthetic ATF delivers outstanding oxidative stability, anti-wear protection, and friction durability for demanding commercial use.

TranSynd 668 is officially Allison TES 668™ approved and is fully backwards compatible with TES 295® and TES 468™ applications; making it an excellent upgrade or replacement fluid for fleets wanting modern performance with backward compatibility.

Key Features & Benefits:

• Premium full-synthetic ATF for Allison heavy-duty, on-highway automatic transmissions

• Allison TES 668™ approved and fully backwards compatible with TES 295® and TES 468™

• Delivers improved gear protection for long component life

• Provides extended anti-shudder and extended clutch-friction durability for smooth, consistent operation

• Excellent corrosion and foaming resistance for reliable performance

• Outstanding thermal and oxidative stability to help prevent deposits and oil thickening

• Helps maintain excellent transmission cleanliness, supporting extended oil-drain intervals and reduced servicing

• Reduced friction can contribute to lower operating temperatures, helping extend oil and component life

• Outstanding cold-flow properties enable faster lubrication of critical parts during cold starts

• Optimized frictional characteristics for smoother gear changes across a wide range of ambient temperatures and loads

• Excellent shear stability to help retain full transmission performance over the entire drain interval

Product Performance Claims:

• Allison® TES 668™

• Voith H55.6335.xx

• Volvo Transmission Oil 97341

• MAN 339 V1, DTFR 13C190 (MB 236.92)

• Backwards compatible with Allison TES 295® and TES 468™

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Shipping: Items will ship via USPS, FedEx or UPS. We are unable to guarantee a specific carrier, even if one is selected or shown at checkout. We will ship via the carrier that has less days in transit to your destination.

Return Policy:

• Buyer has 30 days from receipt of item to request a return
• Buyer pays for return shipping
• Item must be returned in same condition as received
• In no instance will a return or refund be permitted for a used item
• Upon receipt and inspection by seller, refund will be issued within 2 business days. Refund amount will equal amount paid to seller less the fees associated with the transaction

Cancellation Policy:

• If buyer wants to cancel transaction prior to shipment of order, for any reason, the amount refunded will equal amount paid to seller less the fees associated with the transaction