The decision by Chrysler to convert to a HOAT coolant was not a "sales gimmick". Their decision to use the G-05 formula was driven by envioronmental concerns. Prior to their adoption of G-05 they were still using the conventional green or IAT(Inorganic Additive Technology) coolant which has to be replaced at a two year interval. Therefore, auto manufacturers were being pressed to come up with a coolant formulation that provided longer cooling system protection and extended drain intervals. What made matters worse,General Motors had been using their extended life OAT technology (DEX-COOL) in their cars and trucks since 1996.

A Ford Motor Company study concluded that OAT coolants “do not offer any significant advantages for the consumer…” and “…current coolant corrosion protection can be extended far beyond previous expectations”. Both Dodge and Ford were also aware that the OAT formulation (Dexcool) had been associated with cooling system sludge problems related to plasticizers in GM vehicles.

Chrysler adopted the proven G-05 formula in 2001, which had been used by Mercedes and John Deere for over 20 years prior. Ford followed suit in 2002,dropping the conventional green IAT for G-05 factory fill.

 

interesting reading....

http://www.search-autoparts.com/sear...27/article.pdf

 

The following list contains readily available G0-5 HOAT coolants that meet the requirements as per Chrysler spec-MS-9769.

Mopar 5 Year/100,000 Mile with (HOAT) Embittered - Chrysler spec-MS 9769

Ford / Motorcraft Premium Gold Engine Coolant - Ford Part #VC-7A

Mercedes Benz Antifreeze Agent - Part # Q 103 0002

Valvoline Zerex G-05 Hoat - Available in concentrate.
The Valvoline Zerex G-05 can be found or ordered at your local NAPA auto parts as they are suppliers of Valvoline (Ashland) products. The NAPA part # is ZXG051.
I was informed that Zerex G-05 is available at Carquest; however, you must place an order with your local store as it is not a stock item.

The following is from the NAPAOnline shopping page. Very simple to look up, and even shows that Zerex is available at my local NAPA.
Antifreeze / Cooling System, 1 GAL
Product Line: Zerex
Part Number: ZRX ZXG051

Price: $10.88 Gal(s)
Availability: Available Now
Features & Benefits Factory Fill & Approved For Ford & Daimler Chrysler Vehicles, Phosphate Free, Reduced Silicate, Fully Formulated
Manufacturer : Valvoline
Product Application : Zerex G-05 - Concentrate - Liquid - Yellow

 

Th 5 out of 48 gallons. The easiest way to flush it is in the summer, so that you can run it on water for a couple of days. You said when you drain you get 5 out of 8 gallons out - Ithought it was more like 4.5 out of 7 gallons. Anyway, I only do a coolant change every 100K miles, so I want to do a good job. Here is my process: Drain coolant, fill up w/ tap water. Run truck until thermostat opens. Repeat 3 more times. On the last flush you now have only 1.6% of the original coolant in there ((7-4.5)/7)^4). I would then flush out the tap water w/ distilled water three times. On the fourth time, I would drain, fill with 100% anti-freeze (adding only 3.5 gallons of antifreeze) and then top off w/ distilled water. Takes about a week in the summer as i would drain when I got back from work, and fill back up in an hour or so, and repeat next day. But, every night, it would onlu take me 5 minutes to drain & then refill.

 

All I cansay is that Dr.Dizzle sure knwos his chemistry coolants!

 

INDEED. Him and a few others are who I reffer to when I need direct detailed info, becuase I know they have facts and have researched it, rather then just passing along info of things they like because they run.

 

Every 20K miles or so, I just drain whats in my radiator. It usually gets out about 4.5 gallons. Then I replace it with fresh Zerez G-05 and Distilled water mixed to 50/50. I put in 1 gallon of zerex, then 1 gallon of distilled....and so on until full again. I go run the truck and double check my fluid levels.

It doesn't get it all out, but it gets enough out that it keeps like new coolant in it all the time. I guess im just not sure why all the importance is placed on getting out every last drop of the old coolant.

Change it regularly and it stays like new.

..

 

That is the factory drain procedure. The block drain is ineffective... Your changing that much more often than needed. Its 150K mile, 60 month coolant.

Here is my write-up.. Read what I wrote about making sure you get a 50/50.

https://www.dieseltruckresource.com/...n-t262131.html

 

I agree that im draining it much more often than necessary. But I doubt I have any more work involved in it over the course of the 100K or 150K drain with all the flush procedures you described in the thread.

If I drain it every 20K and put the same amount of Zerez/Distilled water back in, over the course of the 100K (5 changes) it will stay "Like New".

It only cost me about $33.00 or so.........3 gallons of Zerex and 3 gallons of Distilled water.......of which I keep over half of a gallon of each for the next time.

I realize it leaves 3 or so gallons of the old stuff in the engine block. But it all gets new stuff recirculated together every 20K....so it stays fresh all the time. No?

..

 

Another effective drain method certain to get the most coolant out is to blow out the rear freeze plug on a regular basis. I don't recommend it... but it is effective.

Let's not discuss how I know...