Coolant (Antifreeze); Engine Oil - Mercury 92‑813054A2 Manual

Coolant (Antifreeze)

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‑cooling 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‑cooling 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‑cooling 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
Marine Engine Coolant
Quantity: 3.75 L (1.0 US gal)
Fleetguard Compleat with DCA4
Quantity: 3.75 L (1.0 US gal)

Engine Oil

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
Mercury 4‑ Cycle 15W40 Marine Engine Oil
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:
90-8M0069748 APRIL 2012
eng
NOTICE
Availability
Europe only
Worldwide
NOTICE
Where Used
Engine crankcase
Section 4 - Specifications
Part Number
92‑813054A2
Fleetguard Part Number: CC2825
Part Number
92‑877695K1
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