Triton® Synthetic Transoil 50

# LBPH778796

Premium Full-Synthetic SAE 50 Manual Transmission Fluid, API MT-1

Phillips 66® Synthetic Transoil 50 is a full-synthetic SAE 50 transmission lubricant designed for use in heavy-duty manual transmissions in trucks and buses operating in extreme temperatures and/or extended service intervals. It combines improved low-temperature properties with outstanding oxidation resistance and thermal stability at high temperatures to provide excellent all-climate, year-round performance.

Features & Benefits

  • Extended drain, all-season performance
  • Outstanding oxidation resistance and thermal stability to minimize sludge and varnish formation
  • Excellent low-temperature properties for easier shifting in cold weather
  • High shear stability
  • High load-carrying capacity
  • Protects against component wear and gear micropitting
  • Protects against rust and corrosion
  • Good foam resistance
  • Excellent seal compatibility
  • Potential fuel economy improvement compared with non-synthetic transmission fluids


  • Heavy-duty manual and semi-automatic transmissions in trucks and buses where the OEM specifies a non-EP, API MT-1 SAE 50 or API GL-1 SAE 90 gear oil, or an SAE 50 heavy-duty engine oil
Licenses & Approvals

Triton Synthetic Transoil 50 meets or exceeds the requirements of:

  • API Service GL-1, MT-1
  • International (Navistar) TMS 6816

Triton Synthetic Transoil 50 is approved for service fill under the following OEM specifications:

  • Eaton PS-164 Rev 7
  • Mack TO-A Plus
  • Meritor O-81

Additional Details

SAE Grade 50
Specific Gravity @ 60°F 0.86
Density, lbs/gal @ 60°F 7.16
Color, Visual Amber
Flash Point (COC), °C (°F) 221 (430)
Pour Point, °C (°F) -45 (-49)
Viscosity, Brookfield
cP @ -40°C 104000
Viscosity, Kinematic
cSt @ 40°C 132
cSt @ 100°C 17.5
Viscosity Index 146

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