There are a few motor oil viscosity options for Mercruiser/GM 350ci/5.7L engines. The 10W-30 grade seems to be the most popular choice for these engines. Others opt for 10W-40 or Mercury’s 25W-40.
What kind of oil does a 350 MerCruiser take?
Mercury MerCruiser 5.0L – 5.7L – 350 Mag – Black Scorpion – 6.2L Four Stroke FC-W 25W-40 Synthetic Blend Oil Change Kit – 2002-Current.
How many horsepower is a 5.7 MerCruiser?
The Mercruiser 5.7 liter marine engine is offered in three different configurations. The standard 5.7 has a propshaft rating of 250 horsepower. The 5.7 EFI or electronic fuel-injected model produces 260 horsepower. The 350 Magnum MPI or Multi Port Fuel Injection engine is rated at 300 propshaft horsepower.
Is there a difference between marine oil and regular oil?
Marine engine oils have to handle high RPM and constant loads experienced by marine engines. … A marine engine oil has to resist shear, moisture and corrosion more than an automotive engine oil, and has to have extremely strong film strength to protect engine parts under constant stress and load.What oil should I use in my boat?
If you operate your boat in consistent temperatures, choose a single-weight oil (e.g. SAE 30). If you operate your boat in a wider temperature range, select multi-viscosity oils (e.g. SAE 10W-30). They behave like thin oils in cold weather, making it easier to crank the engine.
Can I use synthetic oil in my boat?
It’s a bit more expensive, but depending on how much you use your boat, synthetic engine oils can last an entire boating season.” As Becker mentions, another advantage of synthetics is extended oil life. With the greater durability of full-synthetic oils, boat engines can go longer between drain intervals.
Can you use regular motor oil in a boat?
Use the right lubricant —Marine and auto oil are not interchangeable. Although oil in a four-stroke marine engine performs the same function as it does in an automobile engine, passenger car motor oil should not be used in marine engines. … Car oils also fall short in the protection department.
How fast will a 5.7 MerCruiser go?
The engine’s max rpm is about 4,400-4,500rpm. That’s with a light load (1/2 tank gas, two fit adults), minimal stuff in the boat. At this rpm the thing is hitting about 46-48 mph GPS verified.How often should Boat oil be changed?
Change the engine oil at least once every season. Refer to your engine owner’s manual for the manufacturer’s oil change recommendations. Before every voyage, take a minute to inspect all belts and hoses; replace any that are torn or show signs of excessive wear.
How many hours will a MerCruiser 5.7 last?Thanks rasorinc. A friend says “1000 hours” as a general rule for the lifespan of a gas mercruiser inboard/sterndrive engine.
Article first time published onHow much gas does a 5.7 MerCruiser burn?
Select MerCruiser Test ModelHPFuel consumption WOTMerCruiser 5.0 MPI – 305 cid260 hp18.5 GPHMerCruiser 5.7 L – 350 cid260 hp21.0 GPHMerCruiser 5.7 MAG – 350 cid300 hp23.0 GPHMerCruiser 6.2 MAG – 377 cid320 hp24.5 GPH
How much oil does a MerCruiser 350 take?
The amount of oil you must add to the engine varies according to the model year. Engines made from 1998 to 2001 have a larger crankcase than those made between 2002 and 2009. The earlier engines require 5 1/2 quarts. Those made between 2002 and 2009 have a smaller crankcase and require only 4 1/2.
What kind of gas does a MerCruiser take?
MerCruiser engines will operate satisfactorily when using a major brand of automotive unleaded fuel meeting the following specifications: Posted Pump Octane Rating of 91 RON minimum. Premium Unleaded Petrol (PULP 95 RON) is also acceptable. Consult the Owner’s Manual for more details.
Is Marine fuel different from auto fuel?
Boats use the same gas as cars do; the only difference between the boats and car’s gas is the price. A gas at a gas station is a bit cheaper compared to the gas at the marina due to supply and demand. … You can use the same gas you’d put in a car for a boat with a gas engine.
Does a MerCruiser have a thermostat?
The thermostat in your MerCruiser Alpha monitors the temperature of the engine. … If the engine temperature is too hot, the thermostat opens to allow more water into the engine. If the engine is too cold, the thermostat closes so that the water cannot enter the engine to cool it.
Where is the thermostat on a MerCruiser?
Open the engine compartment and locate the thermostat housing. It will be mounted on the front center portion of the engine block with four hoses connected to it. Remove the hose clamps connecting the cooling hoses to the housing with a large flat screwdriver.
What is a marine oil?
Marine Diesel Oil (MDO) is a type of fuel oil and is a blend of gasoil and heavy fuel oil, with more gasoil than intermediate fuel oil used in the maritime field. Marine Diesel Oil is also called “Distillate Marine Diesel”. … Those fuels result from a catalytic cracking and visbreaking refinery.
Do I need marine oil in my boat?
Although some boaters and anglers don’t realize it, using a dedicated marine oil is vital to protecting marine motors. Protection against rust and corrosion is the number-one reason. Despite what most people assume, motor oils have no natural ability to protect against rust or corrosion.
Is Quicksilver and Mercury oil the same?
THEY ARE EXACTLY THE SAME. Mercury stuff is sold at Mercury dealers while Quicksilver is sold at Walmart, Academy etc. This question gets asked a lot in the Merc section. THEY ARE EXACTLY THE SAME.
Do Boats need special oil?
A boat engine requires quality marine oil if you want it to last and perform at its best. … Marine oil is designed specifically to do this. The second main difference between boat engines and automobile engines how hard they run. Marine engines run much faster and spend long periods of time at or near the red line.
How many hours on a boat is too many?
Gasoline boat engines run for an average of 1500 hours before the need for an extreme overhaul. While the average marine diesel engine will run more than three times the gasoline engine will and can log about an average of 5000 hours under the same conditions.
Why should a boat's gas tank never be completely filled?
It’s important to never fill the tank of your boat beyond 90% full. This leaves room for gas to expand and avoids the potential for overflow. Ensure that all air vents and valves to the gas tank are open.
How much does it cost to change boat oil?
If your boat has a single-engine and you opt to change the engine oil yourself, it should cost you about $50 to $75. This depends on the kind of oil you need and also the oil filter. If you take your boat to a professional, they may charge you upwards of $300 to get your oil changed.
How often should you change the lower unit oil?
Most sterndrive and outboard manufacturers advise you to change the gearcase oil in your lower unit every 100 hours or once a year (whichever comes first). Clean oil is critical for protecting the heavily loaded gears in your lower unit and preventing expensive damage.
What RPM should a MerCruiser 5.7 run at?
Mercruiser Bravo One* WOT RPM Range ChartHP/ModelYearWide Open Throttle RPM Range*5.7L 250All4400-48005.7L EFI 260All4400-4800350 Mag MPI 300All4600-5000
What is a good cruising speed for a boat?
Most mechanics and engineers suggest the best cruising speeds are achieved at 3400 and 3800 rpm respectively.
How many HP is a 3.0 MerCruiser?
Models3.0LCrankshaft Horsepower (SAV1 Rating)1351 (1142)Propshaft Horsepower (SAV1 Rating)1011 (852)Displacement181 cid (3.0L)Maximum rpm @ WOT34400-4800 rpm
Is 5.7 MerCruiser a good engine?
The 5.7L gasoline engine and Alpha or Bravo drive make up a solid, easy to maintain package suitable for a wide range of boats and boating life styles. … Both these features help reduce the amount of time your boat is out of the water during routine maintenance.
Is a 5.7 MerCruiser engine?
Displacement350 C.I.D. (5736cc) / 5.7LBore x Stroke4.00″ x 3.48″ (101.60 x 88.39 mm)Main Bearing CapsCast iron GM232-MIgnitionNot IncludedFlywheel Diameter14″ (Ring Gear Towards Engine)
Is 1000 hours a lot on a boat?
As a general rule, experts say that 1,500 hours on a boat is a lot. … Regardless of the hours, a boat that is used around 30-100 hours each year and serviced annually would be a great pick than a boat used less or serviced rarely. And it’s good to look for a boat that is used every year.
How long do MerCruiser engines last?
The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions.
