Section 4 - Specifications
90-8M0057081
eng
MARCH 2011
Page 37
Coolant (Antifreeze)
NOTICE
Using propylene glycol antifreeze in the closed cooling system can damage the cooling system or the engine. Fill the closed
cooling system with an ethylene glycol antifreeze solution suitable to the lowest temperature to which the engine will be exposed.
Because diesel engines are high‑compression engines, they operate at higher operating temperatures. Therefore the closed
cooling system and engine, including related cooling passages, must remain as clean as possible to provide adequate engine
cooling. To ensure proper cooling, we recommend filling the closed cooled section of the cooling system with a low silicate formula
of ethylene glycol antifreeze in a solution with deionized water. A low silicate formula prevents the antifreeze from separating and
forming a silicate gelatin. This gelatin can block passages in the engine and heat exchanger, causing the engine to overheat.
Using deionized water instead of common tap water or softened water can prevent large mineral deposits from forming that restrict
the cooling system efficiency.
Mix the coolant, if it is not premixed, before adding it to the closed cooling system. Additives and inhibitors introduced into
acceptable coolant solutions will form a protective film on the internal passages and provide protection against internal cooling
system erosion.
Keep the closed cooling section filled year‑round with an acceptable coolant (antifreeze) solution. Do not drain the closed cooled
section for storage as this will promote rust formation on the internal surfaces. If the engine will be exposed to freezing
temperatures, ensure that the closed cooled section is filled with a properly mixed coolant (antifreeze) solution to protect the engine
and closed cooling system to the lowest temperature to which they will be exposed.
NOTE: Generally, we recommend using a 50/50 solution of coolant (antifreeze) and deionized, purified water. When operating
where seawater temperatures are greater than 32 °C ( 90 °F), you can use a 25/75 solution of coolant (antifreeze) and deionized,
purified water for improved cooling performance.
IMPORTANT: The coolant (antifreeze) used in these marine engines must be a solution of low silicate ethylene glycol containing
special additives and deionized, purified water. Using other types of engine coolant may cause fouling of the heat exchangers and
overheating of the engine. Do not combine different types of coolants without knowing that they are compatible. Refer to the coolant
manufacturer's instructions.
Some acceptable types of antifreeze and coolants are listed in the following table. See
Maintenance Schedules
for respective
change intervals.
Description
Availability
Part Number
Marine Engine Coolant
Quantity: 3‑3/4 liters, 1 U.S. Gallon
Europe only
92‑813054A2
Fleetguard Compleat with DCA4
Quantity: 3‑3/4 liters, 1 U.S. Gallon
Worldwide
Fleetguard Part Number: CC2825
Engine Oil
NOTICE
Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil, coolant,
or other fluids into the environment when using or servicing your boat. Be aware of the local restrictions governing the disposal
or recycling of waste, and contain and dispose of fluids as required.
To help obtain optimum engine performance and to provide maximum protection, the engine requires engine oil with a rating of
HD‑SAE‑API CG‑4 and CH‑4.
We strongly recommend the use of:
Description
Where Used
Part Number
Mercury 4‑ Cycle 15W40 Marine Engine Oil
Engine crankcase
92‑877695K1
This oil is a specially blended 15W40 oil with marine additives for all–temperature operation. It exceeds requirements for API CF‑2,
CF‑4, CG‑4 and CH‑4 oils.
Other recommended oils:
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