![Mercury/Mariner 25 MARATHON Manual Download Page 58](http://html.mh-extra.com/html/mercury-mariner/25-marathon/25-marathon_manual_1773731058.webp)
Section 4 - Specifications
Page 50
90-8M0074347
eng
OCTOBER 2012
Specifications—3.0 MPI ECT
Engine Specifications—3.0 MPI ECT
NOTE: Performance specifications are obtained and corrected in accordance with SAE J1228/ISO 8665 Crankshaft Power.
All measurements are taken with the engine at normal operating temperature.
RPM range is measured using an accurate service tachometer with the engine at normal operating temperatures.
Oil pressure must be checked with the engine at normal operating temperature.
NOTE: Oil pressure specifications are for reference and may vary.
Propshaft power
101 kW (135 hp)
Displacement
3.0 L (181 cid)
Alternator amperage
Hot
72 A
Cold
65 A
RPM
WOT
4400–4800
Rev limiter
4950
Idle in neutral
700
Minimum oil pressure
At 2000 RPM
207 kPa (30 psi)
At idle
28 kPa (4 psi)
Thermostat
Seawater‑cooled models
71° C (160° F)
Models with Closed Cooling
Timing at idle
Not Adjustable
Firing order
1‑3‑4‑2
Minimum battery rating
375 CCA, 475 MCA, 90 Ah
Spark plug type
AC MR43LTS
Champion RS12YC
NGK BPR6EFS
Spark plug gap
0.9 mm (0.045 in.)
Emission control system
Electronic control (EC), heated oxygen sensor
(HO2S), catalyst
Fuel Requirements
NOTICE
Running out of fuel can damage catalyst components. Do not allow the fuel tanks to become empty during operation.
IMPORTANT: Use of improper gasoline can damage your engine. Engine damage resulting from the use of improper
gasoline is considered misuse of the engine and will not be covered under the limited warranty.
Fuel Ratings
Mercury MerCruiser engines will operate satisfactorily with any major brand of unleaded gasoline that meets the following
specifications:
USA and Canada
‑ A posted pump octane rating of 87 (R+M)/2, minimum. Premium gasoline 92 (R+M)/2 octane is also
acceptable. Do not use leaded gasoline.
Outside USA and Canada
‑ A posted pump octane rating of 91 RON, minimum. Premium gasoline (98 RON) is also
acceptable. If unleaded gasoline is not available, use a major brand of leaded gasoline.
Using Reformulated (Oxygenated) Gasoline (USA Only)
Reformulated gasoline is required in certain areas of the USA and is acceptable for use in your Mercury MerCruiser engine.
The two types of oxygenates used in these fuels are alcohol (ethanol) and ether (MTBE or ETBE). If ethanol is the oxygenate
that is used in the gasoline in your area, refer to
Gasoline Containing Alcohol
.