I have 5k on my current fill of CJ-4 Rotella 15w40. Took a trip to Minnesota Thursday and Friday. Air temps Friday morning were in the 5*F range, and obviously I could not be plugged in at the hotel (true cold start).
I started the truck at 5*F and had almost no hesitation in getting oil pressure (like the ambient temps were 70*F!!!), unlike the CI-4 plus I was using before that literally took forever to get pressure at these temps. I do have a stand alone oil pressure guage on top of the filter housing, so I am seeing real oil pressure.
I could not believe that the oil actually had built pressure or was flowing... so I checked the return flow from my Amsoil bypass filter... I had flow from the bypass filter!!! With the last fill of CI-4 plus, it took a long time to get flow at temps under 20*F...
So, I figured I would post this, I found this quite interesting... the new CJ-4 is acting more like a synthetic than a conventional oil. I would like to hope it would protect as well.
steved
I started the truck at 5*F and had almost no hesitation in getting oil pressure (like the ambient temps were 70*F!!!), unlike the CI-4 plus I was using before that literally took forever to get pressure at these temps. I do have a stand alone oil pressure guage on top of the filter housing, so I am seeing real oil pressure.
I could not believe that the oil actually had built pressure or was flowing... so I checked the return flow from my Amsoil bypass filter... I had flow from the bypass filter!!! With the last fill of CI-4 plus, it took a long time to get flow at temps under 20*F...
So, I figured I would post this, I found this quite interesting... the new CJ-4 is acting more like a synthetic than a conventional oil. I would like to hope it would protect as well.
steved