Engine Oil Discussion
The last time this came up, a check of PQIA test results showed Rotella T4 meeting CK-4 was in the 900 ppm range.
You could see if anything newer is available now.
2020 Analysis of T4 15W-40, API CK-4
Shell Rotella T4 SAE 15W-40 Heavy Duty Diesel Engine Oil | The Petroleum Quality Institute of America
2018 Analysis of T4 15W-40, API CK-4
PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM
2016 Analysis of T 15W-40, API CJ-4, CI-4/SM
Shell Rotella T4 SAE 15W-40 Heavy Duty Diesel Engine Oil | The Petroleum Quality Institute of America
From Widman's paper cited above.
Some important points packed into those two paragraphs.
The last time this came up, a check of PQIA test results showed Rotella T4 meeting CK-4 was in the 900 ppm range.
You could see if anything newer is available now.
2020 Analysis of T4 15W-40, API CK-4
Shell Rotella T4 SAE 15W-40 Heavy Duty Diesel Engine Oil | The Petroleum Quality Institute of America
2018 Analysis of T4 15W-40, API CK-4
PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM
2016 Analysis of T 15W-40, API CJ-4, CI-4/SM
Shell Rotella T4 SAE 15W-40 Heavy Duty Diesel Engine Oil | The Petroleum Quality Institute of America
From Widman's paper cited above.
Some important points packed into those two paragraphs.