Kubota and API CC/CD oils?

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17,298
Location
OH
Can anyone give me a reason why Kubota specs an API CC/CD for their small diesels? These engines call for a 10W-30 grade oil, but the ancient API spec has me wondering. What if we used a modern spec 10W-30 like T5 in this equipment? What harm could it cause? What advantages would a CC/CD oil have?
 
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8,110
Location
MI
It makes one wonder how a company as large as Kubota can drop the ball regarding details like oil recommendations. They had a very controversial recommendation just a few years ago not allowing CJ oils in some of their new tractors. It probably had something to do with Kubota's world market and the availability of ULSD in some areas. Everything seems to be up to date now with this technical service bulletin that states "As of May 2012 this information supersedes all previous publications regarding the use of CJ-4". https://www.kubota.com/service/LubricantMaintenance.aspx FYI, there's a great group of small tractor owners at Tractorbynet.com.
 

fdcg27

Thread starter
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17,298
Location
OH
Thank you! We'll go with T5, then. We have a compact tractor with a bucket, a belly mower and a bushhog and a couple of ZTRs. I bought diesels since I thought that they might hold up better over the years and require less maintenance as well as running a safer fuel. This has some relevance since one of our maintenance staff actually managed to set a Kawasaki powered Ferris on fire some years back. It burned very nicely. We'll see how it goes, since our people could break an anvil, although the Kubotas are doing well in their third season of use. Fortunately, we have a very good wrench on staff. Thanks for the Tractorbynet link. This will no doubt come in handy when we run across a problem that neither I nor our tech can figure out.
 
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495
Location
San Antonio, Texas
Wow...saw this thread and got me thinking...went and grabbed a kubota engine operators manual off of a brand new 2014 D902 equipped industrial pressure washer sitting here in the shop....aparently we are not supposed to be using a cj-4 oil in them..:(...well 50-60 rental units and customer units with 2000+ hours have been doing so since 2010.....here are pics of the operators manual with the ulsd mess....think its actually hurting anything????? ......learn somethin new everyday..
 
Messages
8,110
Location
MI
What you are saying is that the 2014 Kubota owner's manual still prohibits the use of CJ-4 in many/most applications while they have a technical bulletin that states otherwise. shrug Also ironic is that Kubota labeled oil is CJ-4 rated. It's like they can't afford to change their owner's manual. https://www.kubota.com/part/Lubricants.aspx
 
Messages
495
Location
San Antonio, Texas
The way I read our manual is no cj-4 when using ulsd....which is pretty much anything here in the US unless its the red dyed off road stuff but its the same as pump diesel with dye from what I have heard....my engines have no dpf and no egr that I can see/find and its an e series...either way its a clusterf$$$....im gonna keep using what I have till its gone then make a decision....havent had any engine/lube issues so far...2000+ hours on quite a few of them...3600 rpm using all the hp its got all day long in the south texas heat.
 
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dnewton3

Staff member
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8,599
Location
Indianapolis, IN
Kubota has licensed CJ-4 fluids. https://engineoil.api.org/Directory/EolcsResults?accountId=-1&companyName=kubota Why they continue to have confounding and conflicting documents is beyond explanation. If CJ-4 is so wicked as to be avoided, then why do they pay the steep costs to license several of their products to CJ-4? Use CJ-4 with confidence in just about any Kubota diesel application. About the only one I would triple-check before using would be a diesel marine application; other than that you'll be fine.
 
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Messages
47
Location
Kansas
I have been confused on the same information about the type of oil to put in my B2400 Kubota. I wanted to put some 0-30 wt Mobil 1 in the engine but I can not decide to do that or 10-30 rotella.
 
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3,379
Location
BC, Canada
It looks like they want you to match the TBN level to the sulfur content of the fuel. "CD" is an old catch-all classification. It also applies to transmission fluids such as Caterpillar TO-4s, that can usually double as an engine oil.
 

dnewton3

Staff member
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8,599
Location
Indianapolis, IN
Originally Posted By: Durangoboy
I have been confused on the same information about the type of oil to put in my B2400 Kubota. I wanted to put some 0-30 wt Mobil 1 in the engine but I can not decide to do that or 10-30 rotella.
Mobil 1 0w-30 (the normal Mobil 1) is only CF rated https://mobiloil.com/en/motor-oils/mobil-1/mobil-1 Mobil 1 ESP 0w-30 is rated for several MB apps for diesels, but is geared more towards the environmental equipment issues https://mobiloil.com/en/motor-oils/mobil-1/mobil-1-esp Mobil Delvac 1 ESP 5w-40 is rated for CJ-4 http://www.mobil.com/USA-English/Lubes/PDS/NAXXENCVLMOMobil_Delvac_1_ESP_5W-40.aspx You would be much better off using the Rotella. Additionally, it would be a lot less expensive. Don't over-think this. That little engine does not need a super-duper syn to survive. I use conventional 10w-30 Rotella in my Kubota, and it started just fine last year when it was -17 degF (admittedly it turned over a bit slow, but it started and ran just fine). If you want to hedge your bet and feel as though you prefer some type of syn, then march right down to your local WallyWorld and get a jug of T5 10w-30. It's cold crank rating is nearly in line with T6. And still WAY cheaper than a sump full of M1.
 
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Messages
3,561
Location
Central Iowa
CJ-4 was specifically designed with ULSD in mind, along with the needs of the newer emission add ons. Really a non issue though, as there are ample CI-4 and CI-4+ oils still around that would work great in the Kubota. Amsoil still has a very good 10w30/30w that is Ci-4+ rated. No VI's in this oil. A strong, straight 30w synthetic that also qualifies as a 10w30. Not sure how anyone could go wrong with it if it meets the specs they need. If one has a mind to use a synthetic, this would be a good choice. Not saying a conventional would also work fine, just broadening the options. http://www.amsoil.com/shop/by-product/mo.../?code=ACD1G-EA
 
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