I have Cummins engines, not DDs, but a couple of years ago, when we pulled the HEs off and had them serviced, I just bought the recommended AF/water mix in bottles from Cummins, and put that in them. I'm sure it cost me more, but the peace of mind of using what they recommend is worth it. This isn't the same thing as in your case, because they disagree, but if your guy is reliable and you trust him to work on your engines, I'd sure follow his advice like you're doing.
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Re: Coolant Changes - Latest Thought?
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09-19-2020 12:43 PM #12
Re: Coolant Changes - Latest Thought?
I definitely need frost protection on the upper Chesapeake. It appears I have been serviced with Detroit Power Cool Plus pre diluted 50/50 Part No OWI 23519396 Freezing point -34ºF Boiling point 265ºF.
I think I'm good with that.1978 53' Motor Yacht "LADY KAY V"
Hull number 524
Chesapeake Bay