Castrol Carelube HTG is formulated from natural vegetable oils to be more environmentally acceptable than traditional mineral-based hydraulic fluids. Since hydraulic systems are prone to leakage due to high pressures, Castrol Carelube HTG is an excellent hydraulic fluid in applications where leakage could cause water or soil contamination.
Unit of Measure


Viscosity @ 40ºC1 N/A 35-39 cSt
Viscosity @ 100ºC2 N/A 8-9 cSt
Min. Viscosity Index3 N/A 200
Max. Pour Point4 N/A -30 ºC
Max. Demulsification5 N/A 30 mins
Min. Rust Test6 N/A No Rust
Max. Copper Corrosion 3 hrs at 100ºC7 N/A Class 1
Min. FZG Gear Test Fail Stage8 N/A 12
Four Ball Wear Test - 1 hr, 30kg, 1460 rpm9 N/A 0.4 mm

Min. Vickers Vane (V104c, 100h)

N/A Below 5 mg
Flash Point10 N/A 270 ºC518 ºF

Biodegradability (CEC-L-33-T-82)

N/A 95 %


N/A Clear Green Fluid


N/A Bland


N/A Environmentally friendly hydraulic fluid with similar mineral oil level performance.


N/A Formulated from natural vegetable oils, Castrol Carelube HTG is more than 99% biodegradable as measured in the CEC L-33-T-82 tests. Tests indicate that it is capable of being decomposed by biological agents within 120 hours, unlike mineral oil, which may remain intact for much longer, polluting water and soil. Castrol Carelube HTG is recommended for outdoor applications where leakage could result in soil or ground water contamination and substantial fines or claims for damage on the responsible operator. (Spills, however, must be handled the same as for mineral-based fluids.)

Low Toxicity

N/A In addition to its biodegradability, Castrol Carelube HTG has a very low toxicity before, during and after breakdown. This reduces the threat to bacteria, fish and humans coming in contact with contaminated water.

Stay-in-Grade Performance

N/A Castrol Carelube HTG has a very high viscosity index (VI) of 200. Standard mineral hydraulic oils have VIs of around 100. This extra high VI means that Castrol Carelube HTG experiences little change in viscosity during its recommended operating range of 0ºF to 175ºF. Castrol Carelube HTG is also very shear stable which means that it resists breakdown during high shear applications.

Anti-Wear Performance and High Lubricity

N/A Due to its special formulation, Castrol Carelube HTG is inherently a better lubricant than standard mineral-based counterparts. This high lubricity accounts for reduced wear and less fuel consumption due to more efficient operations. Castrol Carelube HTG also contains an anti-wear package that increases its load-carrying abilities.

Shipping Note

N/A Shipping will be quoted upon receipt of your order.

  • 1 ASTM D-445
  • 2 ASTM D-445
  • 3 ASTM D-2270
  • 4 ASTM D-97
  • 5 ASTM D-1401
  • 6 ASTM D-665 A & B
  • 7 ASTM D-130
  • 8 ASTM Din 51354
  • 10 ASTM D-92