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SCA is a generic term. FW-16, DCA4, WixCool, NAPA Kool, Pencool, Nalcool are all SCAs. Many diesel type coolants contain them already mixed: Ford's own, Fleet Charge, anything that says ELC on it.
SCAs come in many flavors: WixCool, NAPA Kool (same thing) and Fleet Charge are nitrite-only formulation. Fleetguard's is a nitrite-molybdate-phosphate mix. Some also use borate. Organic acid is used in ELC (Extended Life Coolant) and is not compatible with the conventional SCAs. Conventional SCAs (the -ates and -ites) are compatible with each other; however, you won't be able to accurately test the protection level if the proportion of them in relation to one another is out of whack which is why you should stick to one type or another.
Me, I use the nitrite ones. NAPA Kool, NAPA filters, NAPA test strips and Fleet Charge.
Hey thanks guys, I run the FW-16 in my truck but I just got a 1979 MF 275 and was thinking about running some in the tractor.
I wasn't sure if the other brands were the same thing.
Thanks for all the different brand names, I didn't realize that there were so many.