I thank the Forum's tolerance of my ignorance in the use and maintenance of "purple" coolant with SCAs. Presume Fleetguard would be preferred for my Cummins 6.7L ISB engine (?) Is this sampling / testing method appropriate?ġ) Allow the engine to run for a period of time (15 minutes?) to circulate the coolant then allow coolant to cool.Ģ) Obtain sample of the coolant from the radiator drain valve (one cup sample adequate?) OR obtain sample from the coolant reservoir (?)Ĥ) If test results are low, add adequate amount of SCA Additive to the coolant reservoir or add to the radiator? Presumably the SCA additive bottle has directions on how much to add (?)ĥ) I only find two brands of SCA Additive - Motorcraft and Fleetguard. Any thoughts from the forum?Īt the risk of really looking stupid, I need the Forum to educate me about sampling, testing and adding SCA additive for the Shell "purple" coolant I have in my 2016 Ventana LE. Since Cummins says "red coolant" is OK for ISB engines, I quite curious about why Freightliner Custom Chassis uses the "purple" coolant with SCAs. I also call Cummins and they stated for my 6.7L 350 HP ISB engine that the "red" extended life coolant was OK. Then I Googled for this coolant specs a found that major manufactures (Shell, Prestone, etc.) make a 'fully formulated' coolant with SCAs and the color is purple. So, during lunch I called the Freightliner Custom Chassis "24/7 Direct" and the "expert" I spoke to said that FCC has the following requirements for engine coolant:ģ) Test SCAs regularly and add SCAs as necessaryĤ) Change coolant at 100,000 miles / 5 years whichever occurs first I asked Newmar via its website about the coolant type for my MH and their response was "contact the chassis manufacturer". I was surprised to see that label and the words "purple coolant" as late last year I had the coolant changed in my 2007 Damon Astoria (which is on a Freightliner XCR chassis and RV Masters in Houston chose to use PEAK Final Charge "red" coolant for the refill. One thing I discovered this past weekend is the radiator has a yellow label stating "Only Use Purple Coolant such as Shell xxx" (I can't remember the exact Shell type while sitting at my desk). I need to resurrect this discussion after had some time to learn more about my "new to me" Ventana LE. I just now reached the "coolant" section of Motorhome 101 class so I'd appreciate any comments the forum has on:ġ) Any bad things from not changing the coolant for perhaps as long as ten years?Ģ) Is the Peak brand Final Charge coolant a good choice? RV Masters uses the Peak brand Final Charge Global Extended Life coolant -> I've had good luck with Peak brand coolants for my automobiles so I presume Final Charge coolant will perform well for my motorhome's engine (?). The owner's manual for my 300 HP Cummins ISB engine says change the coolant every three years regardless of mileage! I'm hoping that the long delayed coolant change has not caused any problems with my coolant system (the engine has 16,800 miles of use) !! The chart you provided is very timely! While my motorhome is at RV Masters in Houston for starter replacement (bad solenoid which is integral to the starter) I'm also having them service the coolant system (drain, flush, refill) as I have no record of the coolant ever being changed since it was "new" in 2007 (I thought I had the coolant changed when I purchased the motorhome three years ago but nothing on the list of work done by PPL Motorhomes at that time).
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