Engine Oils
Product Data
castrol.com/GPS
800 255 4417
May 2025
GPS
Castrol
®
Duratec
™
L
Industry Approvals and OEM Specifications:
Duratec L is approved by or meets requirements with the following OEMs. All are for natural gas types unless
specified.
• Caterpillar - CG132, 170 and 260 engines
• Deutz
• Himsen
• INNIO Jenbacher - type 2 and 3 (gas types A, B and CAT), type 4A (gas types A, B and CAT), type 4B and
4D (gas types A, B, C and CAT), type 6C and 6E (gas types A, B, C and CAT) engines *
• INNIO Waukesha - 12V220GL and 18V220GL engines **Rolls Royce Ulstein (applications with separate
lubrication for turbochargers)
• MTU - series 4000 - L32, L33, L61, L62 and L63 engines
• MWM - TCG 2016, 2020 and 2032 engines Wärtsilä 175SG, 220SG, 25SG, 28SG and 34SG
• Perkins
• Wärtsilä 175SG, 220SG, 25SG, 28SG, 34SG and 50SG
• Wärtsilä 32DF and 50DF dual fuel engines (running predominantly on natural gas)
• Rushton
* Gas type A (Natural Gas), gas type B (biogas/ sewage gas), gas type C (landfill gas), CAT: if an oxidation
catalytic converter is incuded in the scope of supply
** Pipeline quality Natural Gas
Typical Properties
SAE Grade Method Units Results
Kinematic Viscosity @100 °C, cSt ASTM D445 mm
2
/s 14
Kinematic Viscosity @40 °C, cSt ASTM D445 mm
2
/s 106
Viscosity Index ASTM D2270 -- 133
Sulfated Ash, %wt ASTM D874 % wt. 0.45
Total Base Number, Mg KOH/g ASTM D2896 mg KOH/g 5
Flash Point, closed cup method ASTM D93 °C 216
Pour Point, °C ASTM D97 °C -18
Appearance Visual Clear and Bright Clear and Bright
Due to continual product research and development, the information contained herein is based on products purchased in the U.S. and
B26
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