Marine Diesel Gear Oil

[Blue Pearl Captain]

KM2P-1 (S), (G) or (GG):​

• API Service Categories: CD or higher​

• SAE Viscosity: #20 or #30

These specs for Marine Diesel Gear Oil are published by Yanmar for my Yanmar 1GM 10 (9 hp) yet my search this morning turned up no products which list their specs by these ratings.
Can someone recommend a website and product which meets these specs? I only need less than a pint but will likely need to order a qt.
Thanks, in advance. This site has been invaluable.
Smooth sailing!

 

[Ken13559]

should be same as what you put into the crankcase. SAE30 or 10W40 CD grade.

 

[Warren Milberg]

Try Chevron Delo 400 SAE 30w, which I buy at WalMart. Should meet or exceed your standards. Shell Rotella probably does, too.

 

[Blue Pearl Captain]

Thank you. for higher ambient temperatures 15W40 motor oil is recommended but I can certainly get 30W here. I guess I was thrown off by the "gear oil" designation. I've read they aren't the same viscosities,

 

[navigator97]

As Warren referred to above, I have switched over to Shell Rotella T1 which was recommended by the Yanmar dealer. I have a Yanmar 2GM20F (2 cylinder) diesel.

 

[Blue Pearl Captain]

As Warren referred to above, I have switched over to Shell Rotella T1 which was recommended by the Yanmar dealer. I have a Yanmar 2GM20F (2 cylinder) diesel.

Do you also use this in the transmission gear box?

 

[navigator97]

I have used it (Shell Rotella T1) in the engine and I'm using up the existing new Yanmar engine oil in the Transmission. I believe that the Shell Rotella T1 can be used in the transmission, but verify.

 

[Benny17441]

I hate to think that a 1993 engine is about to be 20 years old. In that time motor oil has technologically improved and most current oils will exceed the requirements of days past. In your climate I would recommend you use a 30W oil of your prefferd brand. Actually the transmission being of a clean sealed environment it can benefit by using a top grade synthetic oil. If there are no leaks it could be your last transmission oil change.

 

[Steve Dion]

Benny:

I would have to disagree with you about using synthetic old in an older transmission or engine. My experience when doing this with a standard transmission in a BMW was a disaster. It had never leaked until we switched from regular oil to synthetic.

My advise is to stay away from the stuff unless your mfg. recommends it. I have two cars that use synthetic. This is based on my experience and a few things that I have read.

The other thing is that engines in boats have their own set of problems with salt water in the cooling systems, but the water temperature that is used for cooling is usually constant. While I realize that it is much cooler in the northern climes than in the southern areas it is not like an automobile that may be setting in stop and go traffice in 100+ degree traffic so the need to syn. oils is greatly reduced.

 

[Blue Pearl Captain]

In a related discussion on another site, a fellow who has sold boats for 20 years said he recommends with marine grade SAE 80W-90 gear oil for lower RPM motors as an equivilent. Walmart has Pennzoil and SperTech He's never had an issue.
They are specificaly made with additives and foam inhibitors.
In my area we have no diesel repair shops. Other boaters just help each other. Sometimes, though, it's nice to have outside opinions.
Anchors aweigh everybody. Thank you!

 

[Blue Pearl Captain]

Here's a great oil viscosity chart worth saving (from my dealer friend)
http://www.teamrip.com/viscosity_chart.html

 

[Tally Ho]

KM2P-1 (S), (G) or (GG):
• API Service Categories: CD or higher
• SAE Viscosity: #20 or #30

These specs for Marine Diesel Gear Oil are published by Yanmar for my Yanmar 1GM 10 (9 hp) yet my search this morning turned up no products which list their specs by these ratings.
Can someone recommend a website and product which meets these specs? I only need less than a pint but will likely need to order a qt.
Thanks, in advance. This site has been invaluable.
Smooth sailing!

This is from the Yanmar manual

Greg

 

[Blue Pearl Captain]

This is from the Yanmar manual

Greg

Thanks, Greg. I decided on the Rotella SAE 30 for the engine oil and Pennzoil 80W-90 gear oil for the tranny. I looks like a winning combo (I hope!).
Mine is one of just two diesels out of a 100 or so sailboats on our lake. I even have to hump in fuel so it's a learning process. Thank you for yiour input.
Clear skies on your sails!

 

[Clark]

USE WHAT YANMAR RECOMMENDS.

http://www.yanmarhelp.com/i_box2.htm

 

[Benny17441]

Steve, I do not advocate using synthetic oil for the engine and the main reason is that combustion contaminants dirty the oil just as quick as they do regular oil thus negating a longer life vs price benficial relationship. Synthetic oils are succesfully used in industrial pumps and machinery. When they are used in a closed and clean environment their resistance to breakdown will make them last for a very long time. Sorry about your Bimmer, don't know the particulars, but I use synthetic 30W oil in the Yanmar transmission with no problems. I do understand your warning about using synthetic oils in older transmissions. It is perhaps unknown if the gasket materials used 20-30 years ago can withstand the new chemicals used and surely care must be exercised by those owning older models. I still don't think that a general avoidance of the product is called for.

Multigrade oils are designed to start out thin when an engine is cold and then thicken as the temperature increases. In a transmission the oil barely warms up from engine transferred heat and friction. A multigrade 10W30 when cold will be thinner than 30W and in a transmission application it will remain thinner. I'm not saying a thinner oil will not lubricate but if the manufacturer recommends 20W for cooler climates and 30W for warmer ones that should be the choice. I know some that have mistakenly used ATF when they should have used oil in their transmission with apparently no ill effects so this whole issue may not be that critical but why not go with the manufacturers recommendation for oil grade?

 

[Blue Pearl Captain]

USE WHAT YANMAR RECOMMENDS.

http://www.yanmarhelp.com/i_box2.htm

Thanks, Clarke. I'm glad you provided this chart. I spoke with a US YANMAR rep who confirmed this info. Apparantly these transmissions are not designed to require gear oils.
Sure appreciate your input!

 

[tailwind]

The light duty use most sailboat auxiliaries get can cause cylinder wall glazing when using high performance diesel engine oils.

They recommend for the higher output (3HM) diesels to put Dextron in the transmission. Dextron has been used in my 1GM transmission for the last 29 years. I consider it a superior lubricating fluid to motor oil for transmissions of this type. ZF, formerly Hurth recommends automatic transmission fluid in their transmissions.

 

[kloudie1]

There is a fundamental difference between the transmissions that call for engine oil and those that call for ATF. The Ones calling for ATF use multi-plate clutches to transmit power, very much like an auto transmission in a car.. the ones that call for engine oil use brass (or bronze) cone clutches .. The ones that use ATF have a friction material like brake pads or clutch plates .. That kind of material has a tough time connecting if motor oil is used. ATF has "friction modifiers" that allow the plates to drive better .. The bearings and gears are happy in ATF or motor oil. The cone clutches are designed to work by squishing the oil out from between the cone contact faces. They can do that with ATF or motor oil, but the cones are designed to work with motor oil so I'd use that in those units with cone clutches. I would NOT use "gear oil" because of the additives that are designed for gear face contact and not clutch face drive.. Advice is to use what the transmission was designed for.. Read the name plate on the transmission and use that oil or the upgraded versions of the superseded ratings.. In the past Yanmar has had some wonky translators so there is some mis-information out there with Yanmar's name on it.. but the transmission plate tells the truth..

 

[Blue Pearl Captain]

The light duty use most sailboat auxiliaries get can cause cylinder wall glazing when using high performance diesel engine oils.

They recommend for the higher output (3HM) diesels to put Dextron in the transmission. Dextron has been used in my 1GM transmission for the last 29 years. I consider it a superior lubricating fluid to motor oil for transmissions of this type. ZF, formerly Hurth recommends automatic transmission fluid in their transmissions.

Thanks much for adding this to the discussion!

 

[Blue Pearl Captain]

There is a fundamental difference between the transmissions that call for engine oil and those that call for ATF. The Ones calling for ATF use multi-plate clutches to transmit power, very much like an auto transmission in a car.. the ones that call for engine oil use brass (or bronze) cone clutches .. The ones that use ATF have a friction material like brake pads or clutch plates .. That kind of material has a tough time connecting if motor oil is used. ATF has "friction modifiers" that allow the plates to drive better .. The bearings and gears are happy in ATF or motor oil. The cone clutches are designed to work by squishing the oil out from between the cone contact faces. They can do that with ATF or motor oil, but the cones are designed to work with motor oil so I'd use that in those units with cone clutches. I would NOT use "gear oil" because of the additives that are designed for gear face contact and not clutch face drive.. Advice is to use what the transmission was designed for.. Read the name plate on the transmission and use that oil or the upgraded versions of the superseded ratings.. In the past Yanmar has had some wonky translators so there is some mis-information out there with Yanmar's name on it.. but the transmission plate tells the truth..

Very sound and this is what the YANMAR rep said. It seems there are several different transmissions out there. Very helpful explanation. Thank you.