Sinclair Synthetic Blend 15W-40 CK-4 Heavy Duty Diesel Engine Oil

Sinclair Synthetic Blend Heavy Duty Diesel Engine Oil Heavy Duty Engine Oil

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 Synthetic Blend Heavy Duty 15W-40 CK-4 Diesel Engine Oil gives you unsurpassed protection and better performance, especially in very cold or hot temperatures.

  • Improved fuel economy.
  • Outstanding extended drain capability.
  • An advanced lubricant that meets or exceeds OEM requirements.

Performance You'll Notice

Sinclair Synthetic Blend 15W-40 CK-4 delivers, with outstanding protection and performance. It controls friction and reduces metal-to-metal contact in today’s engine designs as well as older engine models.

Three Keys to Better Performance.

Sinclair Synthetic Blend 15W-40 CK-4 gives you:


  • Extended drain intervals that help achieve fuel economies when following OEM recommendations and oil analysis.


  • Increases wear protection up to 53%.1
  • Unbeatable protection against bearing and engine wear caused by cavitation through increased oil aeration.


  • Deposit control up to 63%2 and better oxidation control up to 83%.2
  • Higher starting TBN (10) gives increased oxidation control and protects against the acid buildup that causes rust and corrosion.

1 To measure friction reduction benefits, engineers used the ball-on-disk traction test.

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


Product and grade is diesel 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 0.105
Cold Cranking Simulator at (°C), cP ASTM D5293 5398 (-20)
Color ASTM D1500 3
Flash Point °C ASTM D92 224
Flash Point °F ASTM D92 435
Gravity, °API ASTM D287 30.55
High Temperature / High Shear Vis at 150°C, cP ASTM D5481 4.3
Magnesium, wt. % ASTM D5185 0.1
Molybdenum, wt. % ASTM D5185 0.0066
Nitrogen, wt. % ASTM D4629 0.105
Noack Volatility, % loss ASTM D6375 10
Phosphorus, wt. % ASTM D5185 0.115
Pour Point °C (°F) ASTM D5950 -36°C (-33°F)
Pumping Viscosity at (°C), cP ASTM D4684 21,600 (-25)
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8732
Sulfated Ash, wt. % ASTM D874 0.99
Sulfur, wt. % ASTM D4951 0.32
TBN, mgKOH/g ASTM D2896 10.0
Viscosity @ 100°C cSt ASTM D445 15.66
Viscosity @ 40°C cSt ASTM D445 116.1
Viscosity Index ASTM D2270 143
Zinc, wt. % ASTM D5185 0.127

Container/Bulk Availability

5 Gallon Product Number - 727-008
2/2.5 Gallon Product Number - 727-009
4/1 Gallon Product Number - 727-007
30 Gallon Drum Product Number - 538-004
330 Gallon Tote Product Number - 727-002
55 Gallon Drum Product Number - 727-003
6/1 Quart Product Number - 727-014
Available in Bulk