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  1. #1
    Gold Member
    Join Date
    Dec 2006
    Posts
    432
    Location
    Oakdale, TN
    Tractor
    Kubota M8540HD ROPS

    Default Kubota engine oil recommendation

    I've got a new kubota M8540 tractor and was unsure which engine oil to use so I submitted a question using the kubota web site.

    I received a call today from a service representative at Kubota headquarters in Atlanta, GA (I'm in Tennessee). I was told that I should use 10W-30 engine oil which has the CE or CF API rating. I was told not to use 15W-40. I was told that I do not need to use Kubota brand oil, I would not void my warranty by using another oil as long as it had the correct weight and API rating.

    My operators manual says 10W-30 or 10W-40 with the CD, CE, or CF ratings. What is interesting is that I contacted two local kubota dealers and they both said to use 15W-40 which contradicts the operators manual and the advice from kubota headquarters.

    So I went today and bought 3 gallons of Kubota 10W-30 engine oil, it has the proper API CF rating, actually it goes up to CI-4 I believe.

    I was also told by Kubota headquarters not to use synthetic oil in the new motor, it had something to do with the rings. Kubota headquarters did not see much value in using synthetic oil but said if I really wanted to use it I should wait until the engine has 150 to 200 hours on it. I think I'll just stay with the standard oils which apparently are very good quality these days.

    I have the hydraulic shuttle wet clutch transmission on my tractor and was told by kubota headquarters that I should use the Kubota SUDT fluid for the transmission/hydraulic fluid.

    Finally Kubota headquarters also said I should use heavy weight 80W-90 gear oil in the front axle instead of the SUDT fluid. He gave me a tip on changing the front axle fluid, he said to open the drain holes at each of the outer hub gear assemblies and drain the fluid and then to use the front end loader to lift the front end a little and then to push down on the tire/wheel to tilt the axle to get more fluid to drain out.

  2. #2
    Silver Member Foothill Rancher's Avatar
    Join Date
    Jul 2008
    Posts
    108
    Location
    Foothills of Sierra Nevada
    Tractor
    Kubota L4400 2 Ford 8n's

    Default Re: Kubota engine oil recommendation

    I have a L-4400, a couple of months ago I went on their web site and saw that CJ4 oil wasn't recommended, emailed them and received a reply that said the CJ4 oil was ok. They was a post here about it.

    I've wanted to try the 5w-40 oil but my dealer didn't recommend it, said they only use 15w-40, when it's cold (below 40f the engine is very loud).
    My manuel states 10w-30 or 10w-40 over 77f.

    So I emailed kubota and just recieved this email, Kubota does not recommend 5w-40 in the L-4400 but 10w-30 or 15w-40 is approved.

    I wish Kubota and all their people would get on the same page, not much unity between anyone except they all seem to think the 10w-30 is ok below 77f.

    I guess at this point I'll use the 10-30 in winter and 15-40 in summer but it would be nice to be able to use one grade of oil.

  3. #3
    Member
    Join Date
    Dec 2008
    Posts
    32
    Location
    COLDSPRING, TX
    Tractor
    L4400 KUBOTA

    Default Re: Kubota engine oil recommendation

    Hi..

    I am in southeast texas, so temperature is a factor here..
    My dealer recommends straight 30w so that is what i have
    been using, but again not much cold weather here...
    BOB AND JAN M...

  4. #4
    Gold Member
    Join Date
    Dec 2006
    Posts
    432
    Location
    Oakdale, TN
    Tractor
    Kubota M8540HD ROPS

    Default Re: Kubota engine oil recommendation

    I agree, kubota and their dealers need to get on the same page and update their API rating and engine oil weight specifications. The guy at Kubota headquarters I spoke with told me that for my new engine and cold weather I should definitely use 10W-30 and not 15W-40.

  5. #5
    Bronze Member
    Join Date
    Jan 2007
    Posts
    64
    Location
    middlebury vt
    Tractor
    B8200hst; L4330hstc

    Default Re: Kubota engine oil recommendation

    Darn, I just put in 15w40 kubota oil per dealer recommendation here in Sunny Vermont.

  6. #6
    Elite Member
    Join Date
    Mar 2005
    Posts
    2,609
    Location
    Bedford, VA
    Tractor
    John Deere 2320

    Default Re: Kubota engine oil recommendation

    I find it strange that they dont recommend the 15w40 - I thought that it was the 'standard' (ie most commonly used) oil recommended for almost all diesel engines - it seems that most ppl recognize 15w40 as being a diesel oil right off..

    Brian
    Bedford, VA
    2320 w/ 62D MMM, 200CX FEL, Pats EZ Change, LX4 Cutter
    Co-owner (with my father) of John Deere 790, 30 HP, 4x4, 513 cutter, 70 FEL
    2012 Nissan Xterra Pro-4x

  7. #7
    Bronze Member rut3556's Avatar
    Join Date
    Dec 2008
    Posts
    91
    Location
    Amherst, NH, USA
    Tractor
    Kubota L2250

    Default Re: Kubota engine oil recommendation

    Quote Originally Posted by sugarmaple View Post
    Darn, I just put in 15w40 kubota oil per dealer recommendation here in Sunny Vermont.

    I've been running Amsoil 15-40 in my L2250 for the past 23 years, and it's never failed to start yet.

  8. #8
    Gold Member Happyman's Avatar
    Join Date
    Jun 2008
    Posts
    478
    Location
    Kents Store, Virginia
    Tractor
    Kubota Grand L 3940

    Default Re: Kubota engine oil recommendation

    At 150 hours I switched from 10w-30 kubota oil to 5w-40 Rotella Synthetic. I'm sticking with this until spring. Then I'll go with the 15w-40 Rotella. The kubota tech I spoke with about 2 months ago said it was just fine to do that...off the record.
    Grand L3940 HST, Wallenstein BX62 chipper, Woods GTR72 tiller, Woods BH90-X backhoe, 724 FEL, forks, 1000lb PTO rotary spreader, Woods PRD8400 finish mower, Leinbach 7' landscape rake, United 7' box blade, Pequea 80 bushel manure spreader, Woods 7' Brush Hog.

  9. #9
    Silver Member Lefty_Kubota's Avatar
    Join Date
    Dec 2008
    Posts
    148
    Location
    Odem Texas
    Tractor
    Kubota B9200

    Default Re: Kubota engine oil recommendation

    15w40 Rotella user here
    Phil Underwood

    Kubota B9200 4X4,FEL,HST

  10. #10
    Super Member
    Rest in Peace
    frank_f15's Avatar
    Join Date
    Mar 2001
    Posts
    6,033
    Location
    BUFFALO ,NEW YORK AREA
    Tractor
    kubota b2400- R4 tires

    Default Re: Kubota engine oil recommendation

    i have been using 15-40 in my B2400 and no prolem and it does get could here in western ny, i just let it warm up good before using it, but that should be SOP for any tractor in cold weather.
    FRANK

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