Sinclair Full Synthetic 5W-40 CK-4 Heavy Duty Diesel Engine Oil

Sinclair Full Synthetic Heavy Duty Diesel Engine Oil Heavy Duty Engine Oil

Sinclair OEMs have advanced engines design to improve fuel economy, reduce emissions and extend oil drain intervals. And Sinclair has innovated and improved engine oil technology to stay in front of these changes.

Sinclair Full Synthetic Heavy Duty 5W-40 CK-4 Diesel Engine Oil gives you unsurpassed protection and better performance, especially in very cold or hot temperatures.

  • Sinclair’s best performance for reliable starts even in extreme cold conditions.
  • Outstanding extended drain intervals.
  • Improved fuel economy.
  • Meets or exceeds the OEM requirements.

Innovation You Can Count On

Sinclair Full Synthetic 5W-40 CK-4 is a technologically advanced lubricant that provides powerful, long-lasting, high-performing protection to manage friction and reduce metal-to-metal contact–giving you outstanding protection for longer engine life.

Sinclair Full Synthetic Heavy Duty Diesel Engine Oil: Performance You'll Notice

Specifically formulated to deliver you the following benefits:


  • Outstanding protection for extended drain intervals.
  • Improved fuel economy – up to 1.6% better when you follow OEM recommendations and proper oil analysis.1


  • Excellent wear protection – up to 53% better 2 – with formulations that improve oil aeration to protect against the cavitation that leads to engine and bearing wear.
  • Better friction reduction, with a powerful oil film that helps prevent metal-to-metal contact on rotating parts.


  • Oxidation control as much as 83% better and 63% better deposit control3 with advanced Sinclair technology that withstands heat and pressure.
  • Higher starting TBN to give you increased oxidation control and protection against rust and corrosion caused by acid buildup.

1 Using HD 10W-30 CK-4, compared to Conventional HD 15W-40 CK-4 during on-highway long-haul service. Savings will vary on idle time and other driving conditions of your fleet or vehicle.

2 Compared to new limits of API CK-4 requirements.

3 Compared to new limits of API CK-4 requirements.


  • This product and grade is a fuel economy and mixed fleet engine oil recommended for naturally aspirated and turbocharged four-stroke diesel engines in which the API CK-4 service categories are recommended. It is formulated for engines operating under severe service and a wide range of cold and hot temperatures.
  • It is backward compatible for CJ-4 and older API service categories.
  • Approved by or meets requirements of major OEMs such as Cummins, Detroit Diesel, Mack/Volvo, Paccar, Navistar, Caterpillar, and others.

Industry/OEM Specifications

API CK-4 Approved
API SN Approved
Ford WSS-M2C171-F1 Approved
ACEA E9, E7, E4, E2 Meets Requirements
API CI-4 Plus, CI-4, CH-4, CG-4, CF-2, CF Meets Requirements
API CJ-4 Meets Requirements
API SJ, SH, SG, SF Meets Requirements
API SL Meets Requirements
API SM Meets Requirements
CAT ECF-3, ECF-2, ECF-1-a Meets Requirements
Chrysler/Fiat MS-10902 Meets Requirements
CID A-A-52306, MIL-PRF-2104G Meets Requirements
Cummins 20086 Meets Requirements
Cummins CES 20081, 20077, 20076 Meets Requirements
Detroit Diesel 93K218, 93K215, 93K214 Meets Requirements
Detroit Diesel 93K222 Meets Requirements
Ford WSS-M2C171-E Meets Requirements
Global DHD-1 Meets Requirements
JASO DH-2 Meets Requirements
Mack EO-O Premium Plus, EO-N Premium Plus 03, EO-M Plus, and prior Meets Requirements
Mack EOS-4.5 Meets Requirements
MAN 3275, 270 Meets Requirements
MAN 3575 Meets Requirements
MB 228.3, 228.31 Meets Requirements
MTU 2.1 Meets Requirements
MTU Type I, Type II Meets Requirements
Renault RLD-4 Meets Requirements
Volvo VDS-4, 3, 2 Meets Requirements
Volvo VDS-4.5 Meets Requirements
Allison C-4 Suitable for Use

Typical Properties

Calcium, wt. % ASTM D5185 0.082
Cold Cranking Simulator at (°C), cP ASTM D5293 6535 (-30)
Color ASTM D1500 2.5
Flash Point °C ASTM D92 225
Flash Point °F ASTM D92 437
Gravity, °API ASTM D287 33.57
High Temperature / High Shear Vis at 150°C, cP ASTM D5481 3.5
Magnesium, wt. % ASTM D5185 0.116
Molybdenum, wt. % ASTM D5185 0.007
Nitrogen, wt. % ASTM D4629 0.124
Noack Volatility, % loss ASTM D6375 12
Phosphorus, wt. % ASTM D5185 0.115
Pour Point °C (°F) ASTM D5950 -45°C (-49°F)
Pumping Viscosity at (°C), cP ASTM D4684 24,113 (-35)
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8572
Sulfated Ash, wt. % ASTM D874 0.99
Sulfur, wt. % ASTM D4951 0.314
TBN, mgKOH/g ASTM D2896 10
Viscosity @ 100°C cSt ASTM D445 14.76
Viscosity @ 40°C cSt ASTM D445 87.75
Viscosity Index ASTM D2270 177
Zinc, wt. % ASTM D5185 0.127

Container/Bulk Availability

4/1 Gallon Product Number - 725-007
Available in Bulk