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Engine Oils
Product Data
Castrol
®
CRB
®
Monograde
[
FORMERLY Castrol Assuron
TM
]
November 2021
Castrol CRB Monograde (SAE 10W CF, 30 CF, 40 CF/CF-2, and 50 CF/CF-2) diesel engine
oil is designed for use in heavy duty diesel engines, hydraulic systems and transmissions
that specify the use of monograde diesel engine oil. It helps provide protection across
multiple applications, encouraging long and healthy engine life.
Advantages
During its working life, your engine faces challenges from combustion by-products that
can form deposits and thicken the oil. Castrol CRB Monograde helps combat these issues in two ways:
• It contains cleaning agents that help to displace particles that may otherwise build up on your engine surfaces,
reducing deposits
• It also contains anti-oxidants, which help to disrupt the chemical reactions that can lead to oil thickening
Industry Specifications and OEM Approvals by Grade:
Castrol CRB Monograde exceeds the requirements of the following API categories:
• 10W: API CF
• 30: API CF
• 40: API CF/CF-2/SF
• 50: API CF/CF-2/SF
Typical Properties
SAE Grade 10W CF 30 CF 40 CF/CF-2 50 CF/CF-2
Density @ 15° C ASTM D4052 0.865 0.880 0.896 0.898
Appearance Visual Clear Clear Clear Clear
& Bright & Bright & Bright & Bright
Viscosity, Kinematic 100° C ASTM D445 6.7 10.2 13.4 17.3
Viscosity, CCS -25° C (10W) ASTM D5293 4650 - - -
Viscosity, Kinematic 40° C ASTM D445 42 83 134 192
Viscosity Index ASTM D2270 115 102 94 96
Sulfated Ash, % wt ASTM D874 0.73 0.75 0.96 1.55
Total Base Number/TBN ASTM D2896 6.1 6.1 7.8 11.6
Pour Point °C ASTM D97 -42 -36 -12 -6
Flash Point, PMCC °C ASTM D93 210 215 220 227
Due to continual product research and development, the information contained herein is based on products purchased in the U.S. and subject to
change without notification. Typical properties may vary slightly.
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