From what I understand because of the closed ccv loop the coking causes clogging of the aftercoolers
https://www.petersoncat.com/sites/cat/files/downloads/Cat%20SAEO.pdf
I’m looking for a good 30wt oil for a CAT 3126 TA I think spec calls for CF-4 and CF in the same manual which is a little confusing
Cat discontinued the oil they recommended for this motor and multi weight oils clog the after coolers.
I’ve been looking at tractor supply brand travelers but...
I have a CAT 3208 T non aftercooled in a boat. I use rotella 15-40. This last analysis showed the oil thickened to 50wt with no signs of coolant or water in it. Also stated contamination was normal. Potassium was up but so was my interval (197 hours) any insight on what could cause it to thicken up?