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I am having the same issue. The dealer pressure tested the system about 10k miles ago and found no issue.
My latest Blackstone report at 40k miles shows elevated Potassium (19) and a ? for coolant%. More of a concern is the increase in iron (59) and aluminum (32).
The truck runs perfectly and I have no complaints, but I also do not want BIG problems.
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2008 F350 FX4 Crew, 4x4, 6.4L, Torqueshift, 4.30, tow command, leather, power everything. 75k+ miles. Built 4/17/2007 (Job 1), Purchased used 3/16/2009
2010 Mustang GT Premium - 4.6L-3V, 5 Speed, Grabber Blue - Now this is FUN!
1997 F250 EXT Cab, 4x4, E4OD, 4.10, 273k+ miles.
Modifications: Pyro & boost guage, 202 T-stat, transmission cooler & Tymar - SOLD!!!!!!!
2004 John Deere 5420 MFWD Utility Tractor with 541 MSL Loader.
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