Only premixed coolant should be added 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.
Do not drain the closed cooling section for storage. The closed cooling section should be kept filled year‑round with an
acceptable antifreeze/coolant solution to avoid rust forming 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 antifreeze/coolant solution to protect the
engine and closed cooling system to the lowest temperature to which they will be exposed.
NOTE: If another brand of coolant is used, it is recommended that a 50/50 solution of coolant (antifreeze) and deionized,
purified water be used. A 50/50 solution will provide freeze protection to –35 °C (–31 °F). Decreasing the solution to 40/60 will
provide freeze protection to –25 °C (–13 °F). Even in the warmest climates, never decrease the solution below 40/60.
Increasing the solution to 60/40 will provide freeze protection to –50 °C (–58 °F).
IMPORTANT: The antifreeze/coolant used in these marine engines must be equivalent to ASTM D4985 or ASTM D6210
standards, containing special additives, and deionized or 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.
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:
Tube Ref No.
Description Where Used Part No.
121
15W-40 4-Cycle Diesel Engine Oil Engine crankcase 92-858042K01
This oil is a specially blended 15W‑40 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:
Description
Where Used Part Number
Shell Myrina
Engine crankcase Obtain Locally
Mopar
Texaco Ursa Super TD
Wintershall Multi‑Rekord
Veedol Turbostar
Wintershall VIiva 1
These oils are approved by Mercury Marine and Marine Power Europe. For all temperature operation use 15W‑40 oil.
Section 4 - Specifications
90-8M0117076 eng FEBRUARY 2018 Page 39
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