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  1. #1
    Super Member
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    frank_f15's Avatar
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    Mar 2001
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    BUFFALO ,NEW YORK AREA
    Tractor
    kubota b2400- R4 tires

    Default 10w-40 VS 15W-40

    DECIDED TO POST THIS QUESTION ON THIS FORUM,probably gets the most hits.my manual call for 10w-30 or 10w-40, very hard to find. can find 15w-40 easily. my question is how much difference can this possibly make? i mean 10w vs.15w cna't make that much diff. tractor is garage kept, average winter temp is 15 to 30 deg. with a few days in the single digits. don't want to start a oil war on brands and such just a simple ans. IS THERE THAT MUCH DIFF?

  2. #2

    Join Date
    Jun 2002
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    232
    Location
    NE Texas
    Tractor
    Kubota L35 TLB, John Deere 550 dozer, Cat D-2 dozer, Allis Chalmers HD-11 dozer

    Default Re: 10w-40 VS 15W-40

    no




  3. #3
    Veteran Member
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    Jul 2002
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    1,598
    Location
    Greene Co, Arkansas
    Tractor
    JD 1050 2wd, Case 580D 2wd

    Default Re: 10w-40 VS 15W-40

    nope... Been using 15w-40 in the 1050 since day one. My manual lists different oils for different temp ranges. 15w-40 fits right in with mine which is about 5deg-104deg.

  4. #4

    Join Date
    Nov 2001
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    311
    Location
    Vermilion County, IL
    Tractor
    2000 B7500HSD Kubota, 2 Case ingersol 448 tractors

    Default Re: 10w-40 VS 15W-40

    I just had a 200 hr done on my kubota B7500 today. The dealer used 15-40 when he changed the motor oil. It must be good enough for them.

  5. #5
    Super Member
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    frank_f15's Avatar
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    BUFFALO ,NEW YORK AREA
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    kubota b2400- R4 tires

    Default Re: 10w-40 VS 15W-40

    thats what i like! short and sweet and to the point. that is what i thought. so today i bought NAPA 15W-40 (made by ashland aka valvoline) and a napa gold filter(made by wix) total cost $13.50. after doing some research decided that the oil and filter was basically the same as the name brands at a more moderate cost+ only 3 mi. from home.agree? disagree?

  6. #6
    Platinum Member hwp's Avatar
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    Dec 2001
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    643
    Location
    St. Catharines, Ontario, CANADA
    Tractor
    Kubota F2400

    Default Re: 10w-40 VS 15W-40

    I agree with you Frank. I use store brand 15W-40 diesel in the winter, store brand 20W-50 diesel in the summer and store brand (Fram) filters. Haven't had any problems.

  7. #7
    Veteran Member
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    Oct 2001
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    1,134
    Location
    South Carolina
    Tractor
    Kubota B7500

    Default Re: 10w-40 VS 15W-40

    I think I remember this coming up before. Someone said that the 10w30 and 10w40 motor oils for diesels were commonly available overseas which is why it's in the manuals for our tractors who are headquartered there. I went ahead and used Rotella 15w40 but stuck with the kubota filters all around along with super udt. Not too bad until you get to the air filters![img]/w3tcompact/icons/shocked.gif[/img]

    Jeff

  8. #8

    Join Date
    Jun 2002
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    232
    Location
    NE Texas
    Tractor
    Kubota L35 TLB, John Deere 550 dozer, Cat D-2 dozer, Allis Chalmers HD-11 dozer

    Default Re: 10w-40 VS 15W-40

    Agreed on the oil.

    Not so sure on the Wix. Try this experiment. Invest the cost of an OE filter and compare the weight. Use both filters, but buy the heavier in the future.

    You'll be fine which ever filter you use, as long as you change it often. But you'll feel better.

    [img]/w3tcompact/icons/grin.gif[/img],
    Dave

  9. #9
    Veteran Member NY_Yankees_Fan's Avatar
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    Mar 2002
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    Location
    Warren County, NJ (60 miles from NYC)
    Tractor
    Kubota BX 2200

    Default Re: 10w-40 VS 15W-40

    Ok to use the 15W-40 year round??

    Tom

  10. #10

    Join Date
    Jun 2002
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    232
    Location
    NE Texas
    Tractor
    Kubota L35 TLB, John Deere 550 dozer, Cat D-2 dozer, Allis Chalmers HD-11 dozer

    Default Re: 10w-40 VS 15W-40

    I'd say yes in New Jersey. No in Alaska. I use 20-50 here in Texas year around.

    I personally think as long as you're not having any problems starting on cold winter days, your weight is light enough.

    (unless you're running a Corvette or Porsche or something else with .0005 main bearing clearances, then you need the 10 or even 5 weight.)

    Dave

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