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Thanks for the Info everyone! All your replies are appreciated. As far as the Speedco UOA, they test the oil on a desktop machine. I know that it is not as good as a lab like blackstone but would yall trust it enough to base extreme oil change intervals like I am trying to achieve? I'm not...

Originally Posted By: BobFout Originally Posted By: Gokhan Originally Posted By: BobFout They are both CJ-4 oils. D1 ESP is only called that [ESP] to distinguish it from the CI-4+ D1 when it came out in 2006. All CJ-4 oils are "ESP" when compared to CI-4 and CI-4+. Yes, this is true. But the...

Hi, I am an expediter and live 10 months out of the year on the road. I have a 2004 Freightliner Columbia with a Mercedes MBE 4000 motor that has 96,000 miles/3,523 hours on a rebuild. I broke the motor in on Conventional oil for 50,000 miles at 10,000 mile oil change intervals. At 50,000 miles...