MerCruiser 350 Magnum MPI, Operation & Maintenance Manual

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CC218
Seacock Size Recommendation
Seacock used, must have an internal cross-sectional area equal to or greater than hose to prevent restricting wa-
terflow. Install valve in an area where it will be easily accessible and supported adequately to prevent hose fatigue.
A 1-1/4 in. (32mm) brass ball or gate valve is suggested.
CC16
Sea Strainer Recommendation
Strainer used must be of sufficient size to ensure that an adequate supply of water will be maintained for cooling
engine. A minimum of 30 gallons per minute (114 litres per minute) flow rate, is required.
CC18
Crankcase Oil
To help obtain optimum engine performance and to provide maximum protection, we strongly recommend the use
of Quicksilver 4-Cycle Marine Engine Oil. If not available, a good grade, straight weight, detergent automotive oil
of correct viscosity, with an API classification of SG/CD II, may be used.
The chart below is a guide to crankcase oil selection. Oil filter should always be changed with oil.
In those areas where recommended straight weight oil is not available, a multi-viscosity 20W-40 (SG/CD II) or, as
a second but less preferable choice, 20W-50 (SG/CD II) may be used.
IMPORTANT: The use of non-detergent oils, multiviscosity oils (other than 20W-40 or 20W-50), low quality
oils or oils which contain solid additives specifically are not recommended.
70534
Quicksilver 4-Cycle Marine Engine Oil
SAE 20W, SG or CD II
SAE 30W, SG or CD II
SAE 40W, SG or CD II
AIR TEMPERATURE
32
°
F
0
°
C
50
°
F
10
°
C