SPECIFICATIONS
17
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CAUTION
Operating a Mercury engine with fuel containing alcohol creates
unique problems as a result of the long storage periods common
to a boat. In other applications, fuels containing alcohol are
normally consumed before they can absorb enough moisture to
cause problems. However, boats are often idle enough for the
problem of phase separation to occur in the fuel. In addition,
alcohol can wash the protective oil film from internal components
resulting in corrosion during storage. Do not store fuel containing
alcohol in a fuel tank for a long period of time.
IMPORTANT: Because of possible adverse effects of alcohol in
gasoline, it is recommended that only alcohol‑free fuel be used
where possible.
If only fuel containing alcohol is available, or if the presence of
alcohol is unknown, increased inspection frequency for leaks and
abnormalities is required.
Crankcase Oil
OIL RECOMMENDATIONS
Preferred Oils API Classification
Mercury 4‑cycle Marine Engine Oil 25W40 SJ, SL, CF‑2, CH‑4
Other Recommendations If Preferred Oils Are Not Available
Premium multi‑viscosity 20W‑50 commercial oil CG‑4, CH‑4, CI‑4
Premium multi‑viscosity 15W‑40 commercial oil CG‑4, CH‑4, CI‑4
Oil Filter Should Always Be Changed With Oil
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