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I'll do just a minimal flush: Dump old, refill with DW and run, trying to force some out my block drains (fumotos), then put right amount of this Delo in and top up with DW.
That's what I did when I had to flush the Delo out of the Excursion due to length of time, a couple years ago. I just drained it and flushed with distilled a few times and refilled with more Delo ELC.
“Especially since I need to re-do my head gaskets and flush the cooling system all over again.”
Why do you think the first went sideways?
They weren’t torqued down properly.
I put a properly calibrated torque wrench to it last July while I had the injectors out and found quite a few inconsistent values. 180 ft/lbs here, 200 ft/lbs there, and a few were close to the 210 ft/lb spec, but it was all over the place, so now it has to be redone.
Once I get the cash and parts together, I’m taking it to a buddy’s shop, pulling the engine, and doing it myself, so I know everything is done correctly and to my satisfaction.