So Im going to do a coolant change on my 06 and I been reading on here about using Hoat or using the green stuff. What should I use and is there real evidence that using this or that causes problems.

 

I changed out the HOAT years ago and I don't even remember why now. Water pump maybe? Anyway, I've been running Prestone/distilled water for probably 500,000 of my 600,000 miles with no ill effects.

 

Why take a chance? Use whats recomende by Dodge.

 

I think the biggest reason for the HOAT is that it lasts for 5 years/100,000 miles between drain intervals. I think if you go to a regular glycol based coolant then you'll probably want to change it more frequently. Something about the corrosion inhibitors last longer in HOAT coolant than regular glycol based coolants.

 

Most green coolants (Prestone is one example) are either a OAT or HOAT anyway these days. At least in my area the ONLY place I have been able to find regular old "green" coolant is Autozone, AND you have to look at the bottle to see what the formulation is as they also have a green HOAT available. That said, the old silicate coolants are really yesterday`s technology. IMO stick with factory fill (unless if it`s Dexcool...but thats a WHOLE other ball o wax, I have Zerex G05 in the wife`s Chevy). FWIW I have Toyota Red (used to work there) in my truck (an OAT coolant) going on 5 years now and it`s as clean AND effective as the day I put it in. Look here
http://www.bobistheoilguy.com/forums...oard=35&page=1
for MORE than you might ever want to know about coolant....search around, there is a TON of good info.

 

Zerex G-05 @ NAPA. $13.99 gallon. I would rather be safe than sorry, IMHO.

 

I love reading bobistheoilguy.com, great site!

I thought I read that OAT coolants were not good because they'll eat up seals and gaskets, hence the reason HOAT was developed? Also I thought Toyota used HOAT coolant, no?

I just stick with HOAT coolant and change it every 100K.

 

The gasket eater coolants use 2-eha which is dexcool or many of the "all makes all models stuff (Prestone). IIRC Toyota`s pink is a hoat (and a notorious water pump eater) but the red is a oat, they are both very good at corrosion protection but I have seen the yota pink kill many pumps (well it`s either the coolant or they need a new pump supplier but it is limited to their veh`s that use pink...which is every toyota built after 05/06 IIRC).

 

After 7 years, 600,000 miles, 2 water pumps, 0 thermostats and 0 leaky gaskets, I don't feel I'm being very risky

 

The decision by Chrysler and Ford to convert to a HOAT formulated coolant 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 a recommended two year replacement interval. General Motors had been using their extended life OAT technology (DEX-COOL) in their cars and trucks since 1996. The GM Dex-Cool coolant can remain in the vehicle for 5 years or 150,000 miles (100,000 for 1996 vehicles). This long life replacement interval was used as a sales/marketing tool by GM which did not bode well for Ford and Chrysler sales.

Therefore, Ford and Chrysler were being pressed to come up with a coolant formulation that provided longer cooling system protection and extended drain intervals. What made matters worse, 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 Chrysler 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 HOAT G-05 formula in their 2001 LHS model vehicles, which had been used by Mercedes and John Deere for over 20 years prior. By 2003, all chrysler models used the HOAT formula as the factory fill. Ford also followed suit in 2002,dropping the conventional green IAT for a G-05factory fill.

 

BINGO!

Hybrid Organic Additive Technology

 

Oh good! What did I win?

 

jbworm20,

Unfortunately the color of coolant no longer indicates that it is of a certain formulation. Green colored coolants are typically available in three formulations (IAT) Inorganic acid technology aka. old school conventional green, (OAT) Organic acid technology and (POAT) Phosphated organic acid technology which is formulated and specified for asian cars. Glysantin G 05 HOAT is a coolant that utilizes ethylene glycol as it's base fluid. Glysantin G 05 is free of amines and phosphates. It contains a robust blend of inhibitors designed to give a high degree of corrosion protection. The G-05 formulation has been proven for many years in the european automotive market.
Prior to being adopted by Chrysler and Ford in 2001 and 2002 respectively, each manufacturer peformed extensive coolant studies. The results of these performance studies concluded that G-05 as the best coolant available.

What may be some of the consequences of using a non approved formulation?
1). Reduced corrosion protection of cooling system components
2). Incompatibility with engine gasket materials
3). Corrosive attack of aluminum components
4). Cylinder wall cavitation and engine block damage in diesel engines
5). Potential water pump issues

The consequences related to the use of non-approved "universal" coolants may not arise immediately, but may occur over longer periods of time due to additive compatibility issues.

Given the aforementioned information, I do not recommend using the "all makes all models" OAT formulated coolants touted as a one size fits all or any other non approved formulation in a vehicle factory filled with HOAT G-05 coolant. The dilution/mixing with non-equivalent coolants will significantly reduce or eliminate the extended life properties. For example, If you mix a 5 year/ 150,000 mile Hoat coolant with an IAT 2year/36000 mile coolant, you must replace the coolant at the 2 year 36.000 mile interval. Most importantly, the mixing of G0-5 HOAT and other formulations may result in unwanted compatability issues.

The third generation Dodge Ram specs. a G-05 HOAT coolant. At the present time, there are four G0-5 HOAT coolants available. All of which are suitable for use in the Dodge Ram CTD. I find that the Zerex and Ford coolants are the cost effective choices over the Mopar and Mercedes offerings. The following list contains those coolants:

Valvoline Zerex G-05 Hoat -
Available in concentrate. The NAPA part # is ZXG051. NAPA carries all of the Valvoline product line. If they do not have it on the shelves or behind the counter, a store associate can order it for you.

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

Mopar 5 Year/100,000 Mile with (HOAT) Embittered

Mercedes Benz Antifreeze Agent - Part # Q 103 0002

I hope you find this helpful.

 

Run the same in my truck for over 350,000 miles.

The back of the package confirms and so did 2 professional diesel mechanics.

 

Or do as I do use a test kit and add the proper addtive kit according to test results .
kits are avaiable at any Cat dealer or Cummings dealer