Compression Ignition Addict
Join Date: Mar 2007
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there is truth in what your mechanic is telling you. one draw-back of any elc coolant is it can take atleast 5,000mi. to gain a protective layer in your engine. the advantage of a high quality low silicate heavy-duty coolant is the protection level is immediate.
with the age of your truck ('05) i would drain/flush, then install coolant filter. original owners manual recommendation is 5 yr./105,000mi., and you are at 5 years.
if you're not a fan of motorcraft gold, there are low silicate heavy duty coolants available, along with many elc's. i have been using john deere cool gard for almost a year now (22,500mi.) with zero issues, eot/ect temp has never been more that 10f. i have 112,500mi. total on my 07.
the problem with gold (my personal opinion) is it can't handle the high egr cooler temps, which in turn is causing the silicate drop-out. the casting sand issue seems to be confined to 03/04 model years. when the 6.0 was introduced many owners were running hot tunes, which were causing very hot exaust gasses, hotter than the egr cooler could handle, causing puking and everything else related, nothing good.