Section 4 - Specifications
90-899883173 DECEMBER 2007 Page 55
• Corrosion of metal parts
• Deterioration of rubber or plastic parts
• Fuel permeation through rubber fuel lines
• Starting and operating difficulties
!
WARNING
Fuel leakage is a fire or explosion hazard, which can cause serious injury or death.
Periodically inspect all fuel system components for leaks, softening, hardening, swelling,
or corrosion, particularly after storage. Any sign of leakage or deterioration requires
replacement before further engine operation.
IMPORTANT: If you use gasoline that contains or might contain alcohol, you must increase
the frequency of inspection for leaks and abnormalities.
IMPORTANT: When operating a Mercury MerCruiser engine on gasoline containing
alcohol, storage of gasoline in the fuel tank for long periods should be avoided. Long
periods of storage, common to boats, create unique problems. In cars alcohol‑blend fuels
normally are consumed before they can absorb enough moisture to cause trouble, but
boats often sit idle long enough for phase separation to take place. In addition, internal
corrosion may take place during storage if alcohol has washed protective oil films from
internal components.
Engine Oil
To maintain optimum engine performance and to provide maximum protection, we
recommend the following oil:
Application Recommended Oil
All MerCruiser engines with Emissions Control
Mercury MerCruiser Full‑Synthetic Engine Oil, 20W‑40,
NMMA FC‑W rated
IMPORTANT: Lubrication requirements for catalyzed engines differ from the requirements
for non‑catalyzed engines. Some marine‑grade lubricants contain high levels of
phosphorus, which can damage the catalyst system on MerCruiser engines. Although
these high‑phosphorus lubricants may allow for acceptable engine performance, exposure
over time will damage the catalyst. Catalysts damaged by lubricants containing high levels
of phosphorus may not be covered by the MerCruiser Limited Warranty.
If the Mercury MerCruiser Full‑Synthetic, 20W‑40 oil is unavailable, you can use the
following lubricants, listed in order of recommendation, for short periods of time:
1. Mercury/Quicksilver 25W‑40 Synthetic Blend, NMMA FC‑W rated 4‑cycle oil
2. Other recognized brands of NMMA FC‑W–rated oils
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