Kubota only recommends 10w30 or 15w40

[Big_B]

I say use HPL 5w40 cold climate oil.

 

[Redhawk454]

Thanks guys for the responses. I’m just wondering why Kubota ONLY recommends 10w-30 or 15w-40 and not say 5w-40.

 

[burbguy82]

Thanks guys for the responses. I’m just wondering why Kubota ONLY recommends 10w-30 or 15w-40 and not say 5w-40.

To my knowledge, Kubota only brands 10w30 and 15w40, which is why I suspect it is in their manual. Use 5w40 with confidence

 

[userfriendly]

Thanks guys for the responses. I’m just wondering why Kubota ONLY recommends 10w-30 or 15w-40 and not say 5w-40.

Those are the two conventional oil choices. Historically 10w40 was only available in conventional and typically sheared out of grade in no time. Same goes for conventional 5w30.
For severe winter service, a 0Wxx might be necessary for cold starts when the machine can’t be plugged in.

In North America, we are spoiled with CK-4 synthetic options that might not be available worldwide.

I spoke too soon about not having a Kubota. I’m picking up a “new old stock” 2020 lawn tractor in two weeks.
Kawasaki 726cc, same as my X320 JD.

 

[UncleDave]

I ran off the shelf 0W40 in a D722 results are posted here.

Even after 500 hours you can barely tell it had been run.

The mill loved it.

 

[facility1]

the recommended viscosity may depend on the outside air temp,and the severity of work conditions, most likely a good 5w-40 synthetic would be fine changed at the proper intervals.

 

[nwjones18]

Mine has been happy on 15w-40 Delvac since I got it in GA. If I lived somewhere cold I’d run 5w-40 myself.

 

[burbguy82]

I ran off the shelf 0W40 in a D722 results are posted here.

Even after 500 hours you can barely tell it had been run.

The mill loved it.

0w40 diesel oil? what kind?

 

[Snagglefoot]

Your dad ran 10w30 and 15w40. Kubota hasn’t bothered to change their owners manuals to take into account the 0w and 5w availability. The big rigs in northern Canada that have to do cold starts run 0w40.

 

[Snagglefoot]

When in Canada:

 

[userfriendly]

When in Canada:

View attachment 237310

I have half a pail of T6 0w40 left. In Canada we also have Duron and Delvac in 0W40.

0w40 was my all season oil back in the day when it was called Esso XD-3.

 

[cptbarkey]

OP asked this question a year ago and is somehow hung on the word "only."

If you self educate on the winter rating of an oil, you will understand that anything that recommends a 15w40 can use 0w40.

 

[UncleDave]

0w40 diesel oil? what kind?

Nope - off the shelf auto oil. Mobil 1.

 

[burbguy82]

Nope - off the shelf auto oil. Mobil 1.

in a kubota diesel?

 

[cptbarkey]

in a kubota diesel?

Onan 8000/ kubota - 160+ hours 10K miles

Feels to me like I can easily hit 200, if not 250-300 hours with this combo. Any guesses to where the condemnation point will be? UD

bobistheoilguy.com

fascinating thread.

 

[UncleDave]

in a kubota diesel?

Yes In several of them, and my Cat (non DPF) diesels in my sig.

My wife was a mobile pet groomer for years and an Onan 8000 (kubota D722) was the power plant in her sprinter van.

The manuals 50 hour OCI/FCI seemed way to short so I started doing UOA's to understand where condemnation point in that application really was.

The factory rated juice was dino 10-30, and having had gallons of the M1 (which exceeded the factory rating) on hand for other reasons I figured Id give it a try.

Triple and even quadruple OCI hours were absolutely no sweat and I ran and serviced vans that racked up 10K hours plus on these.

 

[kschachn]

Plus it has a Mercedes-Benz diesel approval.

 

[UncleDave]

Plus it has a Mercedes-Benz diesel approval.

Nice. At the time it lacked 229.52, and I searched high and low for something I could get off the shelf that did.

I had to mail order oil for the sprinter back then.

 

[burbguy82]

Yes In several of them, and my Cat (non DPF) diesels in my sig.

Plus it has a Mercedes-Benz diesel approval.

so API CF supercedes all other C ratings......?

Man, that oil must be pretty serious stuff. Are we talking about this juice?:

Mobil 1™ FS 0W-40| Mobil™

Mobil 1™ FS 0W-40 motor oil is the result of decades of collaborative development with major car manufacturers and the application of the latest lubrication technology. It helps provide unsurpassed performance under very demanding driving conditions.

www.mobil.com

EDIT:

Seems like you can put that stuff in everything. That might just cover everything. MB 229 is pretty stringent no?

 

[oil pan 4]

Where I work only uses 15w-40 in the Kubota engines.
My tractor gets straight heavy duty off road diesel engine straight 30 weight oil.