Schaeffer 380 SynTuff Max-Shift Synthetic 75W-80 | 5-G

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Schaeffer's 380 SynTuff™ MaxShift Full Synthetic 75W-80 (5-Gallons) is a premium, full synthetic, heavy-duty, on-road transmission fluid that is designed for automated manual transmissions. It is specifically formulated for use in Mack® mDRIVE™ and Volvo I-Shift transmissions that are not under warranty nor have an extended warranty.

SynTuff™ MaxShift Full Synthetic 75W-80 is blended from a unique combination of select synthetic base fluids with a premium, proprietary, multifunctional additive system to provide the following performance benefits:  

• High viscosity index and low pour point.
• Low-temperature fluidity. 
• Extended drain and service intervals. 
• Improved fuel economy benefits.  
• Thermal and oxidation stability, which reduces the formation of sludge, varnish, and lacquer deposits.  
• Rust and corrosion protection.
• Protection against gear and bearing scuffing, pitting, and adhesive wear. 
• Shear stability for better wear protection, especially during severe operating conditions 

Micron Moly®, a proven friction reducer, is added to SynTuff™ MaxShift Full Synthetic 75W-80 to provide boundary lubrication. Micron Moly®, a liquid-soluble type moly, plates itself to the metal surfaces of the gears and bearings. Once plated, Micron Moly® forms an indestructible, long-lasting, solid lubricant film capable of withstanding pressures up to 500,000 psi.  

SynTuff™ MaxShift Full Synthetic 75W-80 is suitable for use and meets the requirements for the following specifications, and applications: Volvo 97307 and 97318 (I-Shift), Mack® mDRIVE™, Older Volvo and Mack VT-type transmissions, MAN 341 Type E4, Applications in regions where severe winter temperatures are encountered, and API MT-1. 

Always consult the owner’s manual and the OEM’s recommendations for the correct fluid recommendations.

Complete application information available in technical data download!

Please allow 5-8 business days plus transit time for fulfillment.

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rev 6.19.25