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Old 04-27-2011, 12:21 PM   #1
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coolant additives

I know this topic has been beaten to death but I still don't get it. I am getting ready to change out my anti-freeze myself. My manual for a 400 cummins ISL states to use a anti-freeze with the additives ready mixed in. I phoned around and I can find extended life as well as regular anti-freeze but have to add in the additives seperatly. How do you use the test strips and how to alter the ratio if required? Or should I just suck it up and buy the additive already added antifreeze. Our local dealer has the extended life as well as regular anti-freeze on sale now but not sure which way to go..Do I still have to test the coolant with test strips all the time??

Can someone please explain this to me as I have read all the archieves on this topic but I still don't understand this procedure. I have not purchased any anti-freeze yet until I hear from you out there.

This is my first pusher diesel so please bear with me on my questions. I know gas engines but not diesels.
Thx
Ted
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Old 04-27-2011, 12:54 PM   #2
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Go to this thread and read my post with the links
http://www.irv2.com/forums/f115/cool...ter-90249.html If you are planning on doing this yourself you must be able to drain the heater system. There are some valves that have to be opened. Where do you plan on dumping your AF? That is a lot of coolant. I would definitely go with the fully formulated long life or the OAT. You can buy these products at Cummins, KW or any other HD truck dealer. KW always have specials. NAPA is overpriced on HD truck stuff.
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Old 04-27-2011, 12:57 PM   #3
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Go with Shell ELC and do away with the filters with additive in it. 300,000 miles and you don't have to touch it.
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Old 04-28-2011, 06:10 AM   #4
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I did mine last year and used Fleetguard ES Optimax from Cummins. It is good for 600 K miles and after 36 months you just add a bottle of charger and your good. I flushed the system (dont forget to run the heater also) and added 1 gallon of 100% and topped it off with 50-50 mix. I realize that I will never come close to 600,000 miles but I just went for the best I could find and this was it in my opinion. Make sure you use distilled water.
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