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Castrol SYNTRANS 75W-85 (Gearbox and t/case oil)



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CASTROL SYNTRANS 75W-85 (Gearbox and transfer case oil)

Do you have problems selecting gears when cold shifting in your Mog?
Full synthetic manual transmission lubricant with outstanding low temperature fluidity, oxidation stability and synchroniser performance.


Recommended for passenger car and light commercial vehicle transmissions, transaxles and transfer cases where API GL-3 or GL-4 and SAE 75W-85 or SAE 80 viscosity is specified.
It has proved to provide excellent synchroniser performance in a range of Mitsubishi passenger car and 4 Wheel drive manual transmissions.
It is also effective in Holden Jackaroo and Rodeo manual transmissions for best cold shift performance and competition applications. It is also approved for Tremec TR3650 manual transmissions as found in the Ford Tickford TE, TS 50 and FPV models.


  • Excellent oxidation stability makes it suitable for high temperature and extended drain service.
  • Proven synchroniser performance makes gear shifting easier and transmission operation quieter.
  • Very fluid at low temperatures for easier cold start gear shifting in synchronised transmissions.
  • Good wear and EP performance ensures component protection under high load conditions reducing downtime and service costs.
  • Compatible with normal mineral oil, hence no special flushing procedure is needed when changing from mineral to synthetic oil.
  • Long drain performance – potentially lower maintenance costs and greater vehicle availability.
  • Specially selected synthetic base fluids and additive system – very stable viscosity in service.
  • Recommended for most commercial vehicle manual transmissions where API GL4 lubricants are required.
  • Has sole approval against MB235.41 for use in G85 transmissions in Mercedes-Benz hybrid trucks, buses and coaches.
  • Temperature reduction during operation extends the performance life of the oil, promoting extended drain intervals, minimal downtime, reduced repair and replacement costs
  • Improved shift comfort, extended synchroniser life reducing warranty and maintenance costs
  • Excellent low temperature fluidity gives improved protection and smooth gear shifts at low temperatures
  • Excellent wear and EP performance provides protection under high loads
  • Optimised efficiency means reduced fuel usage and fewer emissions.


Castrol Syntrans 75W-85 is suitable where the following performance levels are specified:

  • MB-Approval 235.4
  • API GL-4
  • Volvo Transmission Oil 97307: 006
  • Selected Eaton Transmissions
  • SAE 75W-80

Additional information

Weight 17.7 kg
Dimensions 27 × 27 × 27 cm

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