Not everyone makes you do your own research
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Here's a email from Cummins regarding coolant:
> Cummins neither approves nor disapproves products marketed by other
> companies. Cummins Fleetguard subsidiary supplies filters and coolant
> products and their products can be viewed on the Fleetguard page of our
> website.
>
> Cummins recommends a 50/50 mixture of good quality water and low-silicate
> antifreeze, which meets ASTM D4985 test or the silicate level in GM6038.
> Never exceed 68% antifreeze concentration since it decreases freeze
> protection and can cause engine problems and coolant leaks.
>
> The water quality should not have excess levels of calcium/magnesium (less
> than 170 PPM), chlorides (less than 40 PPM) or sulfates (less than 100
> PPM), since these chemicals can cause cooling system corrosion. Preferred
> water is de-ionized, distilled, or de-mineralized. Coolant should be
> replaced every two years for optimum protection of your engine cooling
> system. If the quality of the water is suspect replace coolant.
>
> Cummins recommends the use of fully-formulated antifreeze or coolant
> containing a precharge of Supplemental Coolant Additives (SCA) in all
> engine models except the B5. 9 series which does not have replaceable
> sleeves (liners). Antifreeze or coolant meeting The Maintenance Council
> (TMC) Recommended Practice (RP) 329, "?Ethylene Glycol Base Coolant", or
> TMC RP 330 "?Propylene Glycol Base Coolant" (which contain a precharge of
> SCA) form the basis for these recommendations.
>
> For example, Cummins recommends the use of Fleetguard COMPLEAT coolant,
> which includes low silicate antifreeze as well as DCA additives. COMPLEAT
> is available from any Cummins or Fleetguard authorized dealer.
>
> Fully formulated antifreezes significantly reduce the opportunity for error
> and the need for SCA tracking since the SCA is premixed in the antifreeze.
> The use of partially formulated (heavy -duty) antifreezes is an acceptable
> alternative practice but is not preferred. When partially formulated
> antifreezes are used, the SCA levels should still be monitored.
>
> There is a Fleetguard 'pre-charge' coolant filter that has 12 units of DCA4
> and a service filter with 4 units of DCA. The capacity of the cooling
> system determines how many units of chemical are needed to properly treat
> the coolant. The precharge filters are used when fresh coolant is put into
> the engine cooling system, then the 'service filter' is used to maintain
> the proper DCA level until the next coolant change. Cummins recommends
> that the coolant be changed every 2 years.
>
> There are commercial radiator cleaners available for flushing the cooling
> system, which is a good maintenance practice. The Cummins operation and
> maintenance manual suggests, that after draining the old coolant, fill the
> system with a mixture of sodium carbonate and water (1 pound of sodium
> carbonate to 6 gallons water).
>
> Leave the radiator cap off and run the engine for 5 minutes with the
> coolant temperature above 176 degF, then stop the engine and drain the
> system. Refill the system with clean water and run the engine again for 5
> minutes and drain. Refill the system with a mixture of 50 % water and 50 %
> ethylene glycol or propylene glycol antifreeze. Install the pressure cap
> and run the engine until it reaches 180degF and check for coolant leaks.
> After cooling, check the coolant level again to make sure the system is
> full of coolant.
BTW, I found pre-mixed Shell Rotella Coolant meeting Cummins specs @ Pep Boys & I did the TDR mag recommended "easy" coolant change by draining just the radiator fluid & refilling w/ a little over 3gals. Proceed to do this twice as often as a full flush & have more time enjoying your CTD instead of working on it!
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Mike
------------------
94 2500HD 4X4 5sp w/GearVendors O. D. 4:10 L. S. D. ,
K&N Oval w/ Pre-Filter,
Straight Exhaust,
Geno's Fumotovalve,
AW-Direct Idle Controller,
DiPricol Boost/Pyro/Fuel w/ Kevlar BSS line,
Mag-Hytec Rear,
126K miles.
Halon Protected,
NRA Member.
V1=Anti-"pinch" protection.
Credit for my wise Cummins Diesel procurement must go to "Flash" (Quarter Horse/Appaloosa) & his 4 legged pals!