[C320-list] What antifreeze/coolant?

[Donald Lawson]

To all
I had the same questions. Luckily I am near a Yanmar Dealer so I use their stuff.  But here is from Mac Boring. Use 50/50 if not premixed with Dlstilled Water per Warren.
Note that Dex Cool has been tested and approved.  
Don Lawson
Mandolin Wind #1004
Yanmar recommended coolant - NOT GREEN !
check the yanmar service bulletins. yanmar is no longer recommending the 'green' engine antifreeze', only the 'pink' engine long-life antifreeze. (don't confuse this with the pink potable freshwater system antifreeze for your drinking water system..) 

Excerpts from Service bulletin re: Coolants:
Mack Boring & Parts Company Headquarters: 2365 RT.22 Union, NJ 07083 
PH 908-964-8475, FAX 908-964-8475, WEB www.mackboring.com•Improved water pump life due to reduced water pump seal wear resulting from fewer abrasive 
dissolved solids. 
• Reduces hard water scale. 
• Offers excellent protection against pitting corrosion caused by cylinder liner cavitation. Better 
heat transfer than conventional coolants with regular SCALE additions. 
• No silicate gel formation during use or storage. 
• Outstanding hot surface aluminum protection. 
• Superior protection in high operating temperature conditions. 
• Effective, long-term corrosion protection for aluminum, brass, cast iron, steel, solder and 
copper alloys. 

The coolant/anti-freezes that have been tested and approved are shown below: 
• Texaco Long Life Coolant Anti-Freeze both regular and pre-mixed Product codes 7991 and 
7998. This product is available in gallon containers, drums and bulk. It is recommended that the 
cooling system be drained and flushed before filling. Only Texaco Long Life Coolant should be 
used for top-off. This product has a much longer shelf life than conventional coolants provided 
the integrity of the container is maintained. For additional information and availability contact 
Texaco at 1-800-782-7852. 
• Havoline Extended Life Anti-Freeze/Coolant. Product code 7994. This product is available 
through Texaco gas stations, Procedures are the same as with Texaco Long Life Coolant Anti- 
Freeze. 
• Dex-Cool Long Life Coolant. This product is available through GM service centers worldwide. 
• Prestone Extended Life Coolant. Product code AF888. If the above coolants are not readily 

On Jul 28, 2015, at 5:08 PM, Warren Updike wrote:

> As I am red/green color deficient, I'm not one to comment on the color of anything. However, what I use is a 50/50 premix that I buy at a local auto store. I think it's a yellowish color; but, don't hold me to that. It says on the container that it is compatible with all types of antifreeze. I've been using it for years with no problems. Every season I drain a quart or two and replace with new. Every few years, I drain completely and replace. You can also use some sort of off-the-shelf flush treatment; but, you'd be well to check with the mfgr first. if you do mix your own antifreeze, be sure to use only distilled water - never tap water.
> 
> Warren and Pattie Updike
> 1994 C320 "Warr de Mar" #62
> 
> -----Original Message-----
> From: Marek Fluder [mailto:marekf at gmail.com] 
> Sent: Tuesday, July 28, 2015 8:17 AM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] What antifreeze/coolant?
> 
> Bruce,
> 
> I intend to change coolant in my 3YM30 and am having the same dilemma -
> there is a few recommended brands with Dex Cool being acceptable.
> Checked with local Yanmar parts distributor and they do not carry YG30.
> I would go with Havoline or Texaco recommended products, but have no idea
> where to get them here in Toronto area.
> I might settle for Dex-Cool as this is what is readily available.
> 
> Marek
> #1028
> 
> 
> On Sat, Jul 18, 2015 at 6:29 PM, swampcreek42 <swampcreek42 at yahoo.com>
> wrote:
> 
>> 
>> 
>> 
>> Ok, I've read myself into a stupor. This is good followed by NO! NOT THAT!
>> This shouldn't be an odessy! IT'S ENGINE COOLANT!Anyway I have a 3GM30F a
>> 1999 engine in a 2000 boat (boat built in November 1999). It now has the
>> green stuff, I was happy with it but read it might be a good idea to go to
>> the extended life coolant  (ELC). Since I'm changing out the engine hoses
>> and the thermostat which I believe to be original now 15 years old I think
>> I'll flush the heck out of the engine and change to the red or orange stuff
>> BUT all the information I'm seeing is at least 5 years old and is very
>> contradictory. The local shop states DEX COOL but I've read there were
>> problems and lawsuits over that stuff. Then Havoline ELC is recomend but I
>> also read they make DEX COOL! This is nuts! I'm almost resolved to staying
>> with the green stuff, but read with the green stuff you might need to add
>> supplimental coolant additives which Yanmar doesn't recomend. I do see that
>> Yanmar makes Yanmar Ultra Life YG30 but can't seem to see it advertised
>> locally. Sooooo, what are you all runnimg?
>> Bruce Hunter Nauti Time #719 Pasadena MD
>> 
>> Sent from my Verizon Wireless 4G LTE smartphone
>> 
>> -------- Original message --------
>> From: Scott Thompson <surprise at thompson87.com>
>> Date: 07/18/2015  12:45 PM  (GMT-05:00)
>> To: C320-List at Catalina320.com
>> Subject: Re: [C320-list] Wing vs Fin
>> 
>> 
>> 
>> 
> 
>