Compression Ignition Addict
Join Date: Oct 2006
Location: Walpole, MA
Thanked 22 Times in 21 Posts
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I would not freak out over dex-cool in a 7.3. Dex-cool is an OAT based coolant that uses 2-EHA in it. 2-EHA, which is used in MANY coolants meeting Cat EC-1 as well, gave dex cool a bad name cause it ate the gasket material GM used in some of its vehicles. It is the same reason ELCs aren't recommended for early 99 7.3s cause some, those that use 2-EHA, will eat the injector cup sealant.
Is dex-cool the best coolant for a 7.3... hmm...probably not but it shouldn't hurt anything in a late 99-03 7.3 or a E99 that has had its injectors replaced.
As far as maintenance on my truck I follow the same basic schedule as Codum... oil & filter every 5-7k (except I run whatever brand name 15w40 in the summer and a diesel rated 10w30 in the winter), fuel filter every 15k, ATF in trans every 30k, ATF in the power steering system and xcase every two years, brake fluid every two years. I am running Zerex G-05, same thing as MC gold coolant and I check the SCA's every 15k and add if needed. I did the rear diff about two years ago with redline 75w-140 and probably won't touch it for a while. I haven't done the front diff yet cause I honestly just keep forgetting and haven't had the time recently.
2002 F-350 4X4 ECLB 7.3 4R100 6637 filter w/ RiffRaff cover, 08 diff cover, 203* T-stat, HPX, Stancor Relay, 6.0 trans cooler, Zone leveling kit, 8'6" Western Ultramount
Sold: 04.5 Dodge Ram 2500 5.9 CTD, Reg Cab, 48re