Duragard® Diamond Plate Protection® Synthetic Blend CK-4 SAE 15W-40 Engine Oil

Product Code: DURCK415/40SYNBLxx
AVAILABLE IN: 1 gal (3 per case), 2.5 gal JUG, 5 gal PAIL, 16 gal KEG, 30 gal DRUM, 55gal DRUM, and BULK (in selected areas)

1 gal Jug
(case of 3)

2.5 gal Jug

5.0 gal Pail
16 gal KEG, 30gal DRUM, 55gal DRUM, and BULK (in selected areas)




Gravity, ºAPI ASTM D287 30.99
Specific Gravity @60 ºF (15.6 ºC) ASTM D4052 0.8708
Viscosity @ 40ºC cSt ASTM D445 114.3
Viscosity @ 100ºC cSt ASTM D445 15.92
Viscosity Index ASTM D2270 149
Pour Point ºC (ºF) ASTM D5950 39 ºC (-38 ºF)
Cold Cranking Simulator at (ºC), cP ASTM D5293 4100 (@ -20 ºC)
High Temperature/ High Shear Vis at 150 ºC, cP ASTM D5481 4.3
Color ASTM D1500 3
Zinc, wt. % ASTM D5185 0.127
Phosphorus, wt. % ASTM D5185 0.115
Calcium, wt. % ASTM D5185 0.105
Sulfur, wt. % ASTM D4951 0.32
Magnesium, wt. % ASTM D5185 0.1
Molybdenum, wt. % ASTM D5185 0.0066
Sulfated Ash, wt. % ASTM D874 0.99
Nitrogen, wt. % ASTM D4629 0.105
Pumping Viscosity at (ºC), cP ASTM D4684 21,600 (-25)

Duragard® Diamond Plate® Synthetic Blend CK-4 SAE 15W-40 Engine Oil is an extreme performance (HTHS) high-temperature, high-shear viscosity synthetic blend oil formulated to meet the significantly improved specifications for 2017 and newer engines while being fully compatible for 2016 and prior engines that previously used API CJ-4. API CK-4 will deliver more oxidization protection for hotter, heavy-duty engines, minimizing acid formation, deposits and viscosity increase, promoting reduced wear, improved shear stability, greater oxidation stability, and foam prevention.

Duragard® Diamond Plate® Synthetic Blend CK-4 SAE 15W-40 Engine Oil is a new formula that is specifically engineered for use in mixed fleets, gasoline and diesel. CK-4 has a select additive package for exceptional performance at high temperatures and heavy loads with improved engine protection over previous CJ-4 formulas. The advance in oil technology standards establishes an oil quality specification that helps protect today and tomorrow diesel engines.

Duragard® Diamond Plate® Synthetic Blend CK-4 SAE 15W-40 Engine Oil is a direct replacement for CJ-4 using the same viscosity grades in Synthetic or Synthetic Blend oil types providing protection for all future engine designs, while improving protection of current and previous engines. CK-4 and CJ-4 can be mixed and should have no detrimental impact to engines. However, it is recommended to completely change over to CK-4 oil by using a hot drain of the CJ-4 oil to help minimize residual oil and achieve full benefits of the new oil. Fleets using CJ-4 should implement a secondary storage for CK-4 or completely empty a CJ-4 tank before filling with Duragard® Diamond Plate® SAE 15W-40 API CK-4 Engine oil.


  • * Exceeds warranty requirements of engine manufacturers that require a type API CK-4/SM premium synthetic blend SAE 15W-40 motor oil.
  • * Exceeds performance of current API CJ-4 oils.
  • * (HTHS) High-temperature, High-shear viscosity.
  • * Improved shear stability
  • * More oxidization protection for hotter, heavy-duty engines.
  • * Minimizes acid formation
  • * Reduced deposits
  • * Extended drain intervals
  • * Backwards compatible for all engines currently requiring CJ-4
  • * Meets current 2017 and newer specifications requiring CK-4
  • * Meets Ford’s stringent 2017 and newer WSS-M2C171-F1 specification.

This product meets, or exceeds the requirements similar to the following manufacturers and global specifications:

2017 and Newer Compatibility


Cummins 20086 MAN 3575
Detroit Diesel 938K222 MTU 2.1
Ford WSS-M2C171-F1 Renault RLD-4
Mack EOS-4.5 Volvo VDS-4.5


2016 and Prior Backwards Compatibility

API CJ-4, CI-4 PLUS, CI-4, CH-4, CG-4, CF-2, CF

Global DHD-1/DH-1
API SN, SM, SL, SH GM 6094-M
ACEA E7, E4, E5, E3, E2 John Deere
Agco (Deutz Allis) JASO DH-2
Allison C-4 Mack PREM+07, PREM+03, EO-O/N/M/L, EO-K2
Case/IH MAN 3275, 270
CAT ECF-1-a/ECF-2/ECF-3/EC1/EC2 Massey Ferguson
Chrysler MS-6395-G Mercedes 228.31, 228.3
Cummins NTC 400, CES20081/78/77/76/72 MIL-L-46152/MIL-L-2104F 2/MIL-PRF-2104G
Dept. of Defense (CID)A-A-52039A/A-A-52036A MTU Type I, Type II
Detroit Diesel 7SE270, type 1 & 2 Navistar TSI-85-6
Detroit Diesel 93K218, 93K215, 93K214 MRenault RLD
EMA LRG-1 White/Volvo VDS-4/3/2
Ford WSS-M2C171-D

Constult your manufacturer's specifications for information and use.

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