Transmission Fluids
Product Data
castrol.com/GPS
800 255 4417
May 2025
GPS
Castrol
®
Transynd
®
668
Extended Anti-Shudder Durability
• Up to 10 times higher durability
• Improved shi comfort
• Reduced risk of noice vibration and
harshness over full drain period
Extended Clutch-Friction Durability
• Stable friction over full duration to ensure
constant clutch shi times for preventing
heat generation and friction material
damage
• Smooth clutch engagement via improved
friction stability at low speed for excellent
torque capacity
• Excellent stability of friction levels to
enable consistent gear changes
Typical Properties
Test Method Units Typical Results
Appearance Visual - Bright & Clear
Color VIsual - Red
Density @ 15C, Relative ASTM D4052 g/ml 0.8508
Viscosity at 40°C, cSt ASTM D445 mm
2
/s 33
Viscosity at 100°C, cSt ASTM D445 mm
2
/s 6.9
Viscosity Index DIN ISO 2909 none 168
Brookfield Viscosity at -40 C, cP ASTM D2983 mPa.s (cP) < 12,000
Pour Point ASTM 5950 °C -51
Flash Point, COC ASTM D92 °C > 210
Improved Gear Protection
• Resists higher loads for longer transmission life
• Ensures excellent hardware protection
Castrol TranSynd 668:
No wear marks
Reference Fluid:
Wear marks
D10
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