Often asked: What Type Transit Oil For A 1956 Johnson 3 Horse?

What gear oil should I use in my Johnson outboard?

Valvoline Outboard Gear Oil is designed to be used in leading manufacturer’s outboard gearboxes and gear cases for the following models: Chrysler, Evinrude, Johnson, Mercury, Mercury O.M.C 70 HP Test, Force, Volvo Penta, Suzuki, Yamaha and Tohatsu.

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 gear oil in outboard?

Just make sure you use oil designed for outboard lower units. Most lower unit fluid is 90 weight, but has additives in it to keep it from foaming and blowing out the seals. So in other words, do not use automotive fluid or NON Marine fluid.

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Do you have to drain lower unit oil to change impeller?

Yes, you will need to drain the lower unit fluid.

How often should you change outboard 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.

Can you mix synthetic gear oil with regular?

Yes. There is no danger mixing synthetic and conventional motor oil. However, conventional oil will detract from the superior performance of synthetic oil and reduce its benefits.

Is SAE 90 the same as 80w 90?

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.

Can you overfill lower unit oil?

To answer, yes you can. I have seen guys that will pump it till the oil comes out the top which is correct, but will then put the top screw in & then give a few more pumps for “good measure”. This usually causes overfilling as well as a slight pressurizing if they get that bottom screw in real fast.

How often should the oil be changed on a boat’s engine?

Frequency. Most engine manufacturers recommend that you change your oil every 50-100 hours (check your owner’s manual for your engine’s exact interval requirements).

Can you fill lower unit oil from top?

Filling from the top down will not allow all the air to escape from the gear box The heavy gear lube will stop flowing down as cohesion from surfaces slow it down till it stops as the air wants to go out the top hole If you let it sit overnight all the trapped air would eventually make its way up to the top

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What does GL 5 mean in gear oil?

A GL-5 grade oil has a very high rating for EP (Extreme Pressure) protection. EP gear oils contain additives that prevent metal surfaces from cold welding under the extreme pressure conditions found in situations where boundary lubrication prevails. This is normal and acceptable in all steel gears.

Is there a difference between gear oil and gear lube?

The most obvious answer to this question is that gear oil is generally intended for use in manual gear boxes and transmission fluid is for automatic transmissions. However, as is always the case with automotive lubricants, there are exceptions to this rule.

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. Mercury Premium SAE 80W90 Gear Lube should not be mixed with Mercury High-Performance SAE 90 Gear Lube.

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