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Mobiltrans AST Extra 20 

Mobiltrans™ AST Extra 20

Mobiltrans AST Extra 20 is a high performance multigrade transmission and drive train lubricants engineered to meet the requirements of systems where products meeting Caterpillar TO -4 are specified. These products are uniquely designed to provide low temperature and multi-season service in powershift transmissions, gearboxes, clutches, final drives and hydraulic systems. Mobiltrans AST Extra 20 can be used in cold ambient temperatures down to -35ºC and -45ºC respectively.

  • Excellent frictional properties - Optimum clutch friction retention & slippage control. Excellent anti-chatter brake performance. Extended clutch & brake life
  • Excellent load carrying, anti-wear and EP performance - Greater wear protection, extended component life, reduced cost of operation
  • Outstanding protection against deposit formation - Longer seal life, extended drain & service intervals
  • Protection from corrosion of copper and its alloys - Protects and extends the life of synchronizers
  • Compatible with clutch materials and elastomers - Long clutch component & seal life, reduced oil leakage
  • Excellent foam control protection - Optimum performance in wet brakes, hydraulic system
  • Excellent thermal and oxidation stability Long oil life, reduced wear, extended equipment life - Exceptional shear stability Maintains effective viscosity and film strength during severe operation
  • Outstanding low-temperature fluidity and pumpability - Reduced time from start-up to production, smoother shifting with quicker starts and reduced wear
  • Multi-season capability - Extended drain and service intervals with lower operating costs and higher productivity

Mobiltrans AST products are recommended for use in applications requiring:
CAT TO-4    Quality Level

Mobiltrans AST Extra 20Value
cSt @ 40ºC32.9
cSt @ 100ºC  7.5
Viscosity Index, ASTM D2270206
CCS Viscosity, cP, ASTM D52932,014 @ -30ºC
3,323 @ -35ºC
MRV Viscosity, cP, ASTM D4684 3,594 @ -35ºC
6,885 @ -40ºC
Brookfield Viscosity, cP, ASTM D2983 7,000 @ -40ºC
Low Temperature Pumpability, °C, D4684 -53
Pour Point, ºC, ASTM D97-54
Flash Point, ºC, ASTM D92 170
Density, kg/m3 @ 15ºC, ASTM D4052873

Ambient Temperature Recommendations, ºC 
Transmissions-45 to +20
Hydraulics-45 to +40
Final Drives (Except off-highway trucks, large
wheel loaders and large wheel tractors)
-45 to +10
Final Drives (Off-highway trucks, large wheel
loaders and large wheel tractors)
-45 to 0