Join Date: Jul 2011
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I'm kind of with you in this. I had a huge delta (sometimes up to 40+ degrees), so I changed the thermostat and flushed just with restore + and distilled water. After that, I filled with CAT-1 EC, and my delta was less than 20 (and would only get up above 15 after a couple hours on the highway). So I decided to hold off on the whole job.
Then this weekend, I installed a Sinister EGR cooler and rebuilt the oil cooler, updated the turbo oil feed tube, the STC fitting and the IPR screen, and I definitely notice the difference, but my delta hovers around 8-10 from 60-75 MPH on flat ground.
So, I'm definitely happy with the results, I just thought I would be looking at a closer spread after a 12 hour flush.
EDIT: I failed to mention that I flushed with 48 gallons of distilled water and the restore/restore + combo. I then changed the coolant filter and filled the system with Rotella CAT-1 ELC coolant.