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post #11 of 16 Old 05-14-2019
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Re: How much oil

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What does over filling do?
Transmission oil does not typically cover the gears, rather it is splashed up on them and drains back down to constantly wash them. Overfilling causes the oil to aerate, rather than splash, which reduces its effectiveness.

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Isn't there more volume in the engine (and the transmission for oil than the oil required?
Yes, and this is why many/most manufacturers suggest you top the transmission with oil, for winter storage. This covers the exposed parts of the gear.

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Although I don't service my car... done by dealer service department... I don't recall any regular oil changes for the transmission. Tranny doesn't seem to consume oil...(the way engine does)... Why change it? Does it become contaminated? What is the grade of tranny oil determined by?
Not sure if your questions are about your car or boat. I'm only referring to boats, which have primitive transmissions, compared to automobiles. As the oil washes down the gears and plates, it removes wear. After a while, you can see fine metal in the oil, if you wipe the dipstick on a white cloth. There is typically no filter to remove this metal in our small gears. Most recommend changing at least annually.

Oil also has anti-corrosion additives that dissipate or decay, with simply the passage of time.
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post #12 of 16 Old 05-14-2019
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Re: How much oil

If you see no signs of metal in the tranny oil would it be OK?

What grade of oil do marine transmission use? Same as engine?

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post #13 of 16 Old 05-14-2019
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Re: How much oil

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Originally Posted by SanderO View Post
If you see no signs of metal in the tranny oil would it be OK?

What grade of oil do marine transmission use? Same as engine?
Wouldn't the answer be to simply follow the manufacturers instructions? The oil will eventually be contaminated and eventually lose it's additives.

Some gears take motor oil, others take transmission fluid.


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post #14 of 16 Old 05-14-2019
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Re: How much oil

Minni... I am home at my desk and don't have access to the engine owners manual which is of course on board.... So I asked some questions.

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post #15 of 16 Old 05-14-2019
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Re: How much oil

The manual for my 2002 2gm20f says to use the same oil in the gearbox and the engine.

My gearbox is the Kanzaki KM2P.
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post #16 of 16 Old 05-14-2019
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Quote:
Originally Posted by SanderO View Post

Although I don't service my car... done by dealer service department... I don't recall any regular oil changes for the transmission. Tranny doesn't seem to consume oil...(the way engine does)... Why change it? Does it become contaminated? What is the grade of tranny oil determined by?
Automotive automatic transmissions do have service intervals. They are usually 30-60k miles. Heat breaks down the friction modifiers and detergents.Transmission operation produces contaminates; metal and clutch material. 90% of automatic transmission fluid is 30 or 32 weight hydraulic oil with proprietary additives and red dye.
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