What kind of oil does a Mercury 115 2-stroke take?
Sarah Smith
Published Jan 23, 2026
1987 Mercury 115 (2-stroke) Marine Gear Oil
What oil should I use in my Mercury 2-stroke outboard?
Mercury® Premium Plus 2-Stroke Synthetic Blend Marine Engine Oil brings a specially formulated design with a marine additive package to meet the needs of low- to mid-horsepower outboard engines.
What kind of oil does a Mercury 115 take?
This Mercury oil change kit contains Mercury SAE 10W-30 Marine Engine Oil which features high-tech, anti-wear additives to provide over 30% better camshaft wear protection and greater corrosion and oxidation protection.
How much oil does a Mercury 115 take?
3.17 QT. (106 oz.) 5.28 QT.
What is the best oil to use for 2-stroke outboard motor?
For the best performance, viscosity, and lubrication, we recommend a fully synthetic 100% ester-based lubricant for your two-stroke engine. We highly recommend Royal Purple, Lucas Oil, Valvoline, and Red Line for 2-stroke oils.
28 related questions foundIs Quicksilver a good oil?
1. Quicksilver 4-Stroke EFI Marine Oil. Quicksilver's all-inclusive 4-stroke oil and changing kit is a great choice for easy marine oil changes. It's an inexpensive kit that's simple to use, convenient in nature, and perfect for all marine 4-stroke engines However it has been made with Mercury Mariner engines in mind.
What viscosity is 2-stroke oil?
What Grade Is 2-stroke Engine Oil? Oil for 2-stroke engines used to be made from SAE 40 mineral oil, which was traditionally the most popular. The oil used in modern 2-strokes, however, is much lower viscosity, SAE 15, and requires a low smoke.
What type of oil goes in a Mercury lower unit?
Mercury Premium SAE 80W90 Gear Lube is recommended for lower units for outboards below 75 horsepower.
How often should I change the oil in my Mercury outboard?
It is recommended that the oil and the oil filter be changed every 100 hours or annually on most four-stroke outboards, including the Mercury 150 FourStroke. The annual oil change is a common part of preparing the outboard for storage off-season for many boat owners.
Is Quicksilver oil the same as Mercury?
Mercury oil and Quicksilver oil are one and the same. The Quicksilver brand is for retailers who are not Mercury Marine Dealers, such as your Wal Marts, tackle stores, etc... Quicksilver is in no way cheaper or different - same cost. Mercury Premium oil is recommended for most small 2 cycle outboards.
Can I use 10W30 instead of 25W40?
temperature depend on which outboard the manual covers. The manual for my 2006 50 horse recommends 25W40 for all temperatures and 10W30 only below 40 degrees F. My manual also recommends against the use of "synthetic oils" (that's a little confusing, isn't it?). That's for the 75, 90, and 115hp.
Do outboard motors need special oil?
What Kind Of Oil Do You Put In An Outboard Motor? All marine engines should use FC-W FourStroke (25W-40) Oil 25W40. This oil is suitable for use in all four-stroke engines. Marine four-stroke applications, including outboards, MerCruisers, sterndrives, and inboard engines, are all supported by this oil.
What fuel should I run in my Mercury outboard?
Answer: Fuels containing up to 10 percent ethanol are considered acceptable for use in Mercury engines. Fuels containing higher levels of ethanol are not considered acceptable for use, and the use of fuels containing ethanol higher than 10 percent can void the warranty.
What is the best oil to gas ratio for 2-stroke outboards?
For 2-Stroke outboards that require a 50:1 premix of oil/gas we've put together the following chart to simplify the calculations. Use ONLY 2-stroke outboard motor oil with an NMMA (National Marine Manufacturer's Assoc.) certified rating of TCW3. Never use automobile motor oil in your 2-stroke outboard!
How often should you change your 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.
How long does marine oil last?
The oil should be changed every 3,000 miles, but with modern lubricants, most engines recommend 5,000 to 7,500 miles of oil change.
What is the problem with using your boat engine to drive it onto a trailer?
Using a boat's engine to drive it onto a trailer to fully load it is not an acceptable practice. Using the boat's engine to load onto the trailer is dangerous to your equipment and the people around the loading area. It also erodes the material at the end of the ramp which leads to its deterioration.
Can I use regular gear oil in my lower unit?
So, can you use any old gear lube in your marine lower unit? If you want the best protection possible, and want your lower unit to last as long as your boat, then the answer is no. Consult your engine's manual and look for the proper marine gear lube for your application.
Can I use automotive oil in my 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. The two primary reasons for this: water and wear.
Can you use 10w30 instead of 2-stroke oil?
Oil and gas from 10W-30 can be used in a 2-stroke engine. Of course you can. However, it is not the right lubricant for a 2 cycle engine. SAE 10W-30 is far too thin to provide protection in a 2 cycle engine, and it contains the wrong additives that can cause ash deposits and plug whiskering.
What SAE is 2-stroke oil?
Traditionally, the most popular oil for 2-stroke engines, was an SAE 40 mineral oil. However modern 2-strokes require a low smoke, semi synthetic 2-stroke oil with a much lower viscosity, SAE 15. Older 2-strokes, do not appreciate these thinner oils, so Millers produce CM2T which is a mineral SAE 40.
Is SAE 30 the same as 2-stroke oil?
Can I Use Sae 30 Instead Of 2 Stroke Oil? The SAE 30 Motor Oil is recommended for use in older two- and four-stroke diesel engines that are manufactured by an OEM that specifies the engine oil.