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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-17-2010, 05:25 PM   #1 (permalink)
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Shellzone coolant

I have a 2001 with green coolant. Does anybody have any thoughts on using Shellzone 50/50 green coolant? thanks.
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Old 01-17-2010, 05:44 PM   #2 (permalink)
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It's a good coolant. It requires the addition of SCA. I'd add about 8 ounces of DCA-4 per gallon.
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Old 01-17-2010, 09:50 PM   #3 (permalink)
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444-4D is an expert in the subject, so you can usually rely on what he says.

The key to whether a green coolant is good for your use is the words "low silicate". If the seller claims the antifreeze is low silicate, then it's probably okay to add SCA and run it in diesel engines. Shell includes "low silicate" in their description, So I'd go with it.
http://www.shellusserver.com/products/pdf/Shellzone.pdf

However, 50/50 pre-mixed antifreeze is ONLY good for topping off your cooling system. If you are going to change the coolant, including flushing the heater core out with distilled water, then you have to use concentrate, not 50/50.
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Old 01-17-2010, 10:39 PM   #4 (permalink)
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Quote:
Originally Posted by SmokeyWren View Post
However, 50/50 pre-mixed antifreeze is ONLY good for topping off your cooling system. If you are going to change the coolant, including flushing the heater core out with distilled water, then you have to use concentrate, not 50/50.
That's not true. You could fill with 50/50 and top off with concentrate.

The cooling system holds about 8 gal. After a total flush pulling the block plugs, lower hose, etc. you'll have about 1 gal left in the system that won't come out. That leaves 7 gal to fill. Then fill with 5 or 6 gal 50/50 and top off with concentrate to whatever freezepoint you want. Then you won't have to mess with distilled water at the final fill, it's already in the 50/50.

Also Shell makes nothing but low silicate or silicate free coolants. Same with Prestone and others. High silicate coolants are a thing of the past and it's very hard to find any coolant that's not low silicate or silicate free.

I would double check the make date of that green Shellzone. It only has a shelf life of 18 months because it still has silicate. You might want to look at Shell Rotella ELC it is silicate free and same exact coolant International uses. It has shelf life of 8 years because it has no silicates.

Last edited by Roadrunter; 01-17-2010 at 10:42 PM. Reason: Forgot something
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Old 01-19-2010, 07:23 PM   #5 (permalink)
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Thanks for the input.
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