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Marine Engines Repower – Bayliner Cierra 2655, 1991 model Mercruser MCM 5.0l LX
Dennis, Thanks for your inquiry and the opportunity at earning your business. Since Mercruiser made both Alpha and Bravo sterndrive models with that engine I would not be able to tell you without knowing which one your engine is setup for. Can you give me the original engine serial number? Or can you tell me if [...]

4.3L Marine Engine Longblock Performance Specification
Mike, Thanks for your inquiry and the opportunity at earning your business. The Hp rating for longblocks is determined by the fuel system that’s install back onto the engine. For example since GM only produced one marine version of the 4.3L during this timeframe Mercruiser used this same longblock on their 190 Hp 2 barrel carb [...]

Marine Engines – Replacement marine engine for my boat 5.7 mercruiser 1992 #0d763634
Marty, Thanks for your inquiry and the opportunity at earning your business. Using the links below you can review your options. Let me know if you need any further technical information or help placing your order. In either case I will be glad to assist! Link to Block Code/Serial Number Location http://www.perfprotech.com/store/app_themes/PPT/images/block-casting-no.jpg Link to Remanufactured Longblocks http://tinyurl.com/68kcet8 Link to Remanufacturing [...]

Suzuki Marine Outboard Motors – Replacing a Fuel Pump on a DF70
Step by Step Video Instructions illustrating how to change an electric fuel pump on a Suzuki DF70 outboard motor. Watch Video

Boat Trailer Parts and Accessories – How to Replace a Boat Trailer Hub
Step by Step video instructions illustrating how to replace a leaky oil filled hub on a boat trailer. Watch Video

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You are Here: Tech Specs > Mercrusier Gasoline Requirements

Revised September, 1994

A. GASOLINE RECOMMENDATION FOR ALL MERCRUISER MODELS USA and Canada

Model	Gasoline (Notes 2 & 3)	Additives
1987 and Newer: V8 350 cid, Except EFI Models. (Note 1) 1990 and Newer: 4 Cyl 181 cid, V8 454, & 502 cid, Except EFI Models. (Note 1) 1991 and Newer: V8 540 & 572 cid, Except Supercharged Models. (Note 1)	87 (R+M)/2 Minimum Octane Unleaded Regular or Premium Without Alcohol DO NOT USE Leaded Gasoline	None Required
EFI: V8 350,454 & 502 cid. (Notes 1 & 4)	87 (R+M)/2 Minimum Octane Unleaded Regular or Premium Without Alcohol DO NOT USE Leaded Gasoline	None Required
V6 and All Other Older 4, 6 Cyl & V8 Models, Except Supercharged Models.	87 (R+M)/2 Minimum Octane Unleaded Regular or Premium Without Alcohol DO NOT USE Leaded Gasoline	Quicksilver Valve Lubricant
Supercharged Models. (Note 1)	92 (R+M)/2 Minimum Octane Unleaded Premium Without Alcohol DO NOT USE Leaded Gasoline	None Required

Note 1: The cylinder heads on these engines have hardened exhaust value seat inserts.

Note 2: If gasoline with alcohol must be used, periodically inspect complete fuel system for leaks and do not store fuel in boat’s fuel tank for long periods of time.

Note 3: To increase valve life on all MerCruiser engines, the following recommendations should be considered;

2 Use a propeller that allows engine to operate at or near the top of its maximum RPM range when at full throttle with a normal boat load.

2 Operation at 3/4 throttle setting or lower is recommended. Refrain from prolonged operation at maximum (full throttle) RPM.

Note 4: MCM 5.7L Alpha or Bravo EFI: S/N 0F415136 and Below, MCM/MIE 454 & 502 Magnum Stern Drive or Ski EFI: S/N 0F417515 and Below, MIE 350 Magnum Ski EFI: S/N 0F350545 and Below. USE 87 (R+M)/2 Minimum Octane Unleaded REGULAR Gasoline Without Alcohol. DO NOT USE Premium or Leaded Gasoline.

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A. GASOLINE RECOMMENDATION FOR ALL MERCRUISER MODELS Outside USA and Canada

Model	Gasoline (Notes 2, 3 & 4)	Additives
1987 and Newer: V8 350 cid, Except EFI Models. (Note 1) 1990 and Newer: 4 Cyl 181 cid, V8 454, & 502 cid, Except EFI Models. (Note 1) 1991 and Newer: V8 540 & 572 cid, Except Supercharged Models. (Note 1)	90 RON Minimum Octane Major Brand of Unleaded Regular or Premium Without Alcohol	None Required
EFI: V8 350,454 & 502 cid. (Notes 1 & 5)	90 RON Minimum Octane Major Brand of Unleaded Regular or Premium Without Alcohol	None Required
V6 and All Other Older 4, 6 Cyl & V8 Models, Except Supercharged Models.	90 RON Minimum Octane Major Brand of Unleaded Regular or Premium Without Alcohol	Quicksilver Valve Lubricant
Supercharged Models	98 RON Minimum Octane Unleaded Premium Without Alcohol	None Required

Note 1: The cylinder heads on these engines have hardened exhaust valve seat inserts.

Note 2: If gasoline with alcohol must be used, periodically inspect complete fuel system for leaks and do not store fuel in boat’s fuel tank for long periods of time.

Note 3: If unleaded gasoline is not available, use a major brand of leaded gasoline.

Note 4: To increase valve life on all MerCruiser engines, the following recommendations should be considered;

2 Use a propeller that allows engine to operate at or near the top of its maximum RPM range when at full throttle with a normal boat load.

2 Operation at 3/4 throttle setting or lower is recommended. Refrain from prolonged operation at maximum (full throttle) RPM.

Note 5: MCM 5.7L Alpha or Bravo EFI: S/N 0F415136 and Below, MCM/MIE 454 & 502 Magnum Stern Drive or Ski EFI: S/N 0F417515 and Below, MIE 350 Magnum Ski EFI: S/N 0F350545 and Below. USE 90 RON Minimum Octane Unleaded REGULAR Gasoline Without Alcohol. DO NOT USE Premium Gasoline.

Technical Articles

Revised September, 1994

A. GASOLINE RECOMMENDATION FOR ALL MERCRUISER MODELS USA and Canada

A. GASOLINE RECOMMENDATION FOR ALL MERCRUISER MODELS Outside USA and Canada