|Archive for ltlhotshot.myfreeforum.org A forum for Hotshot Owner Operators using 3500, 4500, and 5500 series trucks to transport LTL freight and for those who want to learn about the business.
Best coolant for 6.0??So what coolant is really best. Here is some info.
The coolant concentration should be maintained at 50/50 mix of coolant and distilled water. The level of coolant
should be maintained at the "COLD FILL" range in the coolant reservoir. If you suspect any coolant system leaks or
lack of cooling, pressure test the cooling system. Refer to your Owner Guide for additional information.
• Engine coolant system nitrite strength should be checked and serviced at the mileage or equivalent hour intervals
specified by the maintenance schedule. Check coolant nitrite strength using the 3-Way Antifreeze Test Strip kit
Rotunda # 328-00001 to determine if additive is required. If the nitrite strength is between 800 ppm & 300 ppm add 32
fl. oz. (946 mL) of Supplemental Coolant Additive Motorcraft VC-8 or equivalent. If nitrite strength is below 300 ppm
flush & refill engine coolant (refer to Motorcraft Premium Gold Engine Coolant Change Record) – Do not add
Supplemental Coolant Additive if flush & refill is required.
“There are 3 basic types of engine antifreeze:
IAT (Inorganic Acid Technology) - This is the original old style antifreeze, FMC used this up through 2002 MY trucks, 2003 MY cars, usually Green in color. Service life 36k miles.
OAT (Organic Acid Technology) - Silicate free, GM started using this in 1996 called "Dex Cool" usually orange/red color. Meets Cat EC-1 requirements. This is used by Audi, Jaguar, Porsche, Volkswagen, Land Rover & most Asian vehicles. Service life up to 150k miles.
HOAT (Hybrid Organic Acid Technology) - This is the newest antifreeze formula. It contains small amounts of Silicates to prolong aluminum component life and reduce cavitation wear of aluminum components. Ford started using this in 2003 MY trucks, 2004 MY cars (Ford "Gold" Coolant, WSS-M97B51-A1). This Coolant meets 'European G-05" specifiecations and is used by Ford, Chrysler, Mercedes, BMW & Volvo. Service life up to 150k miles.
Currently the only compatible coolants for the Ford 6.0 is either Ford "Gold" or Zerex G-05.
OAT technology was co-developed by GM & Texaco to produce the Dex Cool. Chevron purchased Texco and now markets and OAT product under the Delo name. OAT technology was developed to try and find an antifreeze that could be used for extended drain intervals.
HOAT technology was developed after problems with OAT technology (Note: there is also a NOAT (Nitrate) techology that is similar to OAT, that was developed by Texaco at Caterpillars insistance to reduce cavitation problems in diesel engines, but is currently not used by any automotive manufacture). In addition, Cummins totally backed away from the use of OAT coolant after experiencing silicone engine seal degredation, aluminum radiator failures, and completer plugging of radiators, these problems have also occurred in GM & Caterpillar equipment. In addition GM has experienced numerous cases of cast-iron block corrosion in 4.3L engines running OAT coolant.
Ford, Chrysler and many European vehicles now use HOAT coolant after problems with OAT coolant were found. All coolant types meet the ASTM spec D3306, but this specification is not nearly as stringent as some of the independent manufactures specs.
GM is facing ongoing lawsuits over OAT problems even in 2005-2006 vehicles and has done a few things, 1) Issued directives that OAT coolants never be installed in a vehicle that was not factory filled with OAT, 2) shortened the mileage interval between changes, 3) redesigned the water pump to eleminate cavitation problems experienced in vehicles running OAT coolant, 4) stated to never mix OAT with any other type of coolant.
The NARSA (National Automotive Radiator Service Association), has repeatedly warned of the pitfalls of OAT technology and the problems with mixing coolant types. NARSA current recomendation is to never mix coolant types, if the coolant type needed is not available then distilled water should be used. “
It appears you have already done enough homework to get you pointed in some direction. There is a ton of discussion on the subject on many of the other Ford oriented websites. Some would swear by the Motorcraft Gold while others will tell you to use Zerex. There seems to be some discussion on the silicate issue with the Motorcraft Gold. It could be a carry over from the earlier history you mentioned, but there have been problems reported and claims made concerning its contribution to failure in the cooling system. Many of these claims outline both coolant silicate and casting material combining to cause many of the restriction problems associated with the oil cooler. I just recently did a major tear down of my motor and replaced my oil cooler due to recent high oil temps. Examination showed lots of sludge restricting coolant flow in the old cooler. I installed a coolant filter a long time ago and have changed my coolant more often than every 30k miles. Did the Motorcraft Gold help to cause the problem? I don't know the real answer, but from what I saw it didn't seem to help. In the meantime I decided to flush the entire engine block and system, install new thermostat, new oil cooler, new coolant filter and refill the cooling system with CAT ELC. I will be checking it periodically to see how it works in this application.