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.

What kind of oil do you put in a lower unit?

You can use any brand of lubricant that has a grade designation of API GL5 SAE 80 or 90 weight. Make sure you do not mix different oil brands or weights. into the BOTTOM drain hole. Then slowly squeeze the bottle to force the oil into the lower unit.

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.

How much oil does a Mercury lower unit take?

5.28 QT. (169 oz.)

What kind of oil does a MerCruiser 5.7 take?

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 oil does a 7.4 MerCruiser take?

It is recommended that the manufacturer's own MerCruiser SAE 20W-40 Full Synthetic Oil be used for the engine.

Can you fill lower unit oil from top?

oil is very thick and the air can't pass through it fast enough. You will fill the LU until oil comes out and you will think it is "filled" when in fact, it won't be. Filling from the bottom pushes the air out, unobstructed, hence a full LU.

What is the best outboard 2 stroke oil?

Our top pick for the best two-stroke oil is the Lucas Oil Semi-Synthetic 2-Cycle Oil. It comes in a wide range of different sizes and works well in a number of different two-stroke engines. If you're looking for our best value pick, check out the Pennzoil Marine XLF 2-Cycle Oil.

What kind of oil does a Mercury 115 4 stroke 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.

Is SAE 90 the same as 80W-90?

Can I use SAE 80W-90 instead of SAE 90w? Yes it is the same… close enough anyway. SAE 90 gear oil is equivalent to 50wt engine oil (SAE 80 = 30wt), so you could always dump that in instead if you want.

How often should I change my 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 is the difference between gear lube and gear oil?

The main difference is it does not have the addiditive (friction modifier) you normally get in a synthetic. This additive is what makes it ok with hypoid gears. You need to buy that separately and add it. Do some tight figure 8's in a parking lot to mix it in and you are good to go.

Is Quicksilver and Mercury oil the same?

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 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.

How do I know if my Mercury has a lower unit oil?

Shut the motor down. Remove the lower unit's vent plug, a large bore, countersunk screw which you may remove with a standard slotted screwdriver. If oil does not leak from the vent plug when you remove the screw, the lower unit oil level is low.

Can you use synthetic oil in a 2 stroke engine?

In the world of 2-stroke oil, there are two basic offerings on the market: petroleum-based oils and fully synthetic oils. Additionally, a number of manufacturers offer various blends of petroleum and synthetic oil. Synthetic oil has proven to be best for 2-stroke engines.

Can you use normal 2-stroke oil in an outboard?

Outboard Engine Oil. A frequent question we answer at DHS Equipment, is about oil for 2-cycle engines. Many people ask, "can I use outboard engine oil in my 2-cycle equipment?" This has been debatable for years, but the short answer is, no, you should not.

What kind of oil goes in an outboard motor?

FC-W FourStroke (25W-40) Oil

25W40 is recommended for all marine engines. Things to know about this oil: For use in all four-stroke marine engines. This oil is engineering approved for all marine four-stroke applications including outboard, MerCruiser, high performance, sterndrive/inboard.

Why is my lower unit oil milky?

That milky color and consistency is most likely due to water intrusion. It will not break down from use and get lighter, like other oils as it breaks down and gets used it darkens. Time to change seals and when you do your water pump do the whole kit and not just the impeller.

What color should outboard gear oil be?

Brand new gear oil should be a shade of blue, green, brown, or yellow, depending on the brand. Used gear oil should be a black/dark variation of the brand new color.

How do you change the gear oil on a Mercury outboard?

Unscrew and remove the vent plug. The vent plug is located near the top of the lower unit, almost straight up from the drain plug. As soon as you loosen the vent plug, the flow of gear oil from the drain plug will steadily increase. Remove the washer and stow it next to the drain plug.

What oil should I use in my 454?

The 454 is highly recommended to be serviced by General Motors with 10W-30 oil if you can't find the owner's manual. If the SAE rating is 10W-30, you can choose either a synthetic blend of fully synthetic oil.

How much oil does a 454 Mercruiser hold?

I've owned a number of boats with 7.4/454 engines, and the owner's manuals say 7 quarts which is also the case with Chevy trucks I've owned. The Chevy's always came to the full mark on the stick after adding 7 quarts. Problem is, 5 quarts is what it takes to bring the oil level to full on a MerCruiser.

What oil does a Marine 454 take?

choice, 20W-50, with API service ratings of SH, CF/CF-2 may be used. that contain solid additives are specifically not recommended. when changing engine oil. It seems like all of my Mercruisers for the past 25 years all spec'd Mercruiser 25W-40 or straight SAE 40 for most warm-ish (above freezing) weather conditions.