Shell Spirax S6 ATF A668 3*1 GAL CASE

Shell Spirax S6 ATF A668 oil is a fully synthetic, heavy-duty automatic transmission fluid which is specifically designed and approved for use in transmissions requiring Allison TES-668 fluids. Spirax S6 ATF A668 is approved for extended service intervals and remains stable even under severe operating conditions.

• Fully synthetic heavy-duty automatic transmission fluid (ATF)
• Designed for Allison medium & heavy-duty automatic transmissions
• Built for extended drain intervals and severe operating conditions
• Type: Full Synthetic ATF
• Specification: Allison TES-668 approved
• Backward compatibility: TES-295 applications

Product Classification

• Type: Automatic Transmission Fluid (Heavy Duty)
• Base Oil: Full Synthetic
• Application:
  • Automatic transmissions
  • Some heavy-duty hydraulic systems (OEM dependent)

Applications

Recommended for:

• Allison automatic transmissions (buses, trucks, commercial vehicles)
• Municipal fleets (buses, emergency vehicles)
• Heavy-duty trucks and coaches
• Motorhomes and vocational vehicles
• Some Voith transmission systems (OEM approved cases)

Performance Characteristics

• Stable operation under high temperature and heavy load
• Excellent cold-flow behavior for smooth engagement
• Maintains consistent hydraulic pressure and shift quality
• Designed for long service intervals (fleet maintenance savings)

Property

Value

Type

Full Synthetic ATF

Viscosity @40°C

~34.3 cSt

Viscosity @100°C

~6.9 cSt

Viscosity Index

High (stable across temperature range)

Density @15°C

~0.851 kg/L

Pour Point

~-51°C

Flash Point

~210°C

Specifications & Approvals

Meets or exceeds:

• Allison TES-668 (Primary approval)
• TES-295 (backward compatible)
• Volvo 97340 / 97341
• Voith H55.6335.xx
• Ford Mercon (select applications)
• GM Dexron III / IIIH
• MAN 339 Type V1
• JASO 1A

Performance Highlights

• Long fluid life → reduced maintenance cost
• Excellent gear and clutch protection
• Smooth and consistent shift quality under load
• Stable performance in stop-and-go fleet operations
• Reduces wear in high-torque transmissions

Important Notes

• Only for automatic transmissions requiring TES-668 or approved specs
• Not suitable for manual transmissions or engine use
• Mixing with incorrect ATFs may reduce performance or damage transmission