I have been using Prestone concentrated anti-freeze (I mix 50% - 50%
with distilled water in the coolant) for years in my Yanmar 2 GMF, both
as a coolant and to winterize.....no problem that I have occurred.....FWIW.
Rob Abbott
AZURA
C&C 32 - #277
Halifax, N.S.
On 2018-10-17 2:34 PM, Bruce Whitmore via CnC-List wrote:
Hello all,
As a result of a concern about tracking down a potential antifreeze
leak (which I haven't done yet), I wanted to confirm the coolant
type. There is no mention as to specific types either in my 3JH2E
operating or service manuals. Yes, I could go (way) out of my way to
get Yanmar branded coolant, but let's face it - it is not only way
more expensive, its available almost exclusively at Yanmar dealers,
and the nearest one to me is 15 miles away and isn't open on Saturdays
or Sundays. And of course, what happens if you need more when you're
out cruising?
In doing research, I found the following bulletin, published by Mack
Boring:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=2ahUKEwizh_zu8Y3eAhWOy1MKHSFlD3cQFjADegQIBxAC&url=http%3A%2F%2Fldmarineservice.com%2Ffiles%2Fyanmar_bulletins.pdf&usg=AOvVaw3WK3R6vfJyTHOt5yGzFMDZ
In the section about coolants, it recommends:
Texaco Long Life Coolant, numbers 7991 and 7998. Unfortunately, one
really can't find either product on the web, so I can't seem to find
if it was orange (DEXCOOL) or red for diesels, or for that matter if
it was ethylene glycol or propylene glycol based.
Havoline Extended Life Anti-Freeze/Coolant, number 7994. Per this
link, 7994 is DEX-COOL, but is ethylene glycol based.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwij_o2I843eAhWK0FMKHXc5AfMQFjAAegQICxAC&url=http%3A%2F%2Fwww.rialtainfo.com%2Fvw%2Fvw_images%2Fradiator_%26_coolant.pdf&usg=AOvVaw3ZxHApMqFHHgB-qcUwOYWa
Dex-Cool Long Life Coolant, which at least at the time of introduction
was propylene glycol based and is Organic Acid Technology (OAT) thus
meaning less toxic. Funny thing is, Dex-Cool was not even introduced
until a year after my boat was built (1995) and at the time, was only
being used in GM cars.
Prestone Extended Life Coolant, product code AF888. Per the attached,
guess what, it's Dex-Cool.
https://www.autozone.com/antifreeze-radiator-additives-and-windshield-wash-fluid/antifreeze/prestone-antifreeze-engine-coolant/87934_0_0.
It is ethylene glycol based, but Prestone says it is OAT, which would
seem to conflict with what I can find about traditional Dex-Cool.
Not entirely satisfied, I wanted to see what a Yanmar official
publication recommended. In a 2009 JH Series Operation Manual, it
recommends Texaco 7997 and 7998 (same as above). It also recommends
Havoline 7994, as above. It however says nothing about Dex-Cool or
Prestone AF888. I get similar results in a 3JH4E manual.
Then, of course, I was faced with the fact that while I used Prestone
AF888 when I flushed and replaced my coolant, I was replacing what
appeared to be traditional green coolant (presumably old-style
ethylene glycol). I only now read a lot of horror stories of
replacing green with orange Dex-Cool, saying that one can never flush
out the system sufficiently to keep the orange coolant from gelling to
the point the engine overheats.
So, at this point I have no real idea what to thing other than the
Prestone AF888 I used should be OK as long as it doesn't a). Turn
color B) Gel up and c) My engine temperature stays OK.
Sigh...
Does anyone else here have anything more authoritative?
Bruce Whitmore
1994 C&C 37/40+ "Astralis"
(847) 404-5092 (mobile)
bwhitm...@sbcglobal.net
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