Duragard Diamond Plate CK-4 SAE 5W-40 Engine Oil is an extreme performance (HTHS) high-temperature, high-shear viscosity fully synthetic oil formulated to meet high-performance demands with long drain capabilities, possible increase in fuel efficiency and reduced over all costs. 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. Suitable for mixed fleets.Duragard Diamond Plate CK-4 SAE 5W-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 CK-4 SAE 5W-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 Synthetic CK-4 SAE 5W-40 Engine Oil. 2017 and Newer CompatibilityAPI CK-4/SNCummins 20086Detroit Diesel 938K222Ford WSS-M2C171-F1Mack EOS-4.5MAN 3575MTU 2.1Renault RLD-4Volvo VDS-4.5
O**E
Didn't seize my engine
Bought this case for my 2019 Ram Cummins 6.7, meets Cummins CES20086 and API CK-4 & verified CK-4 specs on the API website. Drove home 25 miles from work and my engine didn't seize, engine seemed smooth just like normal with the other oils I've used (Rotella & Mobil1). Walmart doesn't seem to stock 10w30 or 5w40 API CK-4 oils anymore so this will probably be my new go to.
S**.
Meets 2018 6.7l PowerStroke requirements
100% synthetic oil that meets the 2018 ford superduty 6.7l PowerStroke requirements. And it's available on amazon at a reasonable price so no need to drive around trying to find some place with the proper oil specs. Purchased this Pack 4 times and will be purchasing my 5th soon.
T**N
Five Stars
AA+
G**N
True 100% Synthetic Oil!
It's rare to find 100% synthetic oil in the United States. Most say "full synthetic" because they cannot say 100%! In Europe, FULL synthetic means 100% but not in the United States. 100% synthetic means it is free of oil and produced completely in a lab. But synthetic oil in the United States will say full instead and are "Certified by the PETROLEUM Industry"! If they were actually 100% synthetic oil, the petroleum industry most certainly would not be certifying them because it has no petroleum products in it. Do some research; Mobil One isn't 100% synthetic! Good job Duragard!
C**.
Only the best!
Hands down the best oil on the market!
Trustpilot
1 month ago
1 week ago
