Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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4 gallons sounds about right, even if you are opening both block drains. All the more reason to flush multiple times since so much stays in the system.
You are using full strength coolant right? If you have bottles of 50/50 you will never get it to the proper strength.
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter