Regal 26 FASDECK Owner's Manual page 263

Storage & Winterization
GENERAL NOTES ON ANTIFREEZE
NOTICE
Engine cooling uids must be replaced with a marine
antifreeze solution; mix antifreeze according to directions
USE A SPECIAL NON TOXIC ANTIFREEZE
for the lowest expected temperature. e above method IN THE FRESH WATER & WASTE SYSTEM
is much more reliable than just draining the engines and WHICH IS AVAILABLE AT RV AND
manifolds because sometimes pockets of water can form
MARINE DEALERS.
which can freeze in cold temperatures and cause engine
DO NOT USE AN AUTOMOTIVE
damage. Draining the system fosters rust in engine parts. TYPE ANTIFREEZE.
Historically, antifreeze was originally made with
IT CAN BE HIGHLY
methanol. It was because of its chemical nature to escape
POISONOUS AND CORROSIVE!
into the atmosphere and a high corrosion factor on
engine metals that it was replaced.
Today, ethylene glycol is used in auto and marine engine
applications because of its positive thermal properties.
On the downside ethylene glycol contains silicate rust
inhibitors that can clog up marine heat exchanger
surfaces. is is why it is so important to follow the
engine manufacturer maintenance schedules which
include changing the antifreeze periodically. In addition,
the unpleasant odor of antifreeze is caused by tolytriazole
which also contributes to it being environmentally
hazardous. Notwithstanding, ethylene glycol is poisonous
to the human body along with animals. erefore, it
cannot be used in potable marine water systems.
Propylene glycol is considerably less toxic and retail
products are labeled as "non-toxic antifreeze". It is the
product of choice for marine water and waste tanks
in freezing climates. It is available at marinas, RV
dealerships, and retail marine outlets.
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