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Diesel oil types?

Discussion in 'Mechanic and Repair' started by Bunton Guy, Jan 17, 2003.

  1. Bunton Guy

    Bunton Guy LawnSite Bronze Member
    Messages: 1,902

    I got a new bobcat diesel 61"z rider...it came with the 20hp Yanmar diesel. The book says to use 10W30 but my diesel truck (f-350) takes 15w-40 (rotella T ) just curious what is anyone else running in their yanmars?
  2. ducky1

    ducky1 LawnSite Senior Member
    Messages: 252

    We dont have any yamars but we run rotella in everything we have . Always have had good luck with rotella.
  3. Ricky

    Ricky LawnSite Member
    Messages: 154

    I have a 26 hp. Yanmar. I also use 15w 40 Rotella T. :)
  4. Bunton Guy

    Bunton Guy LawnSite Bronze Member
    Messages: 1,902

    My Yanmar manual says to use a SAE J-300C oil and DO NOT USE
    API-CE, CF-4, CG-4 and the bottle of Rotella T says it meets and or exceeds CF-4 & CG-4....so I guess that means not to use it?
  5. 65hoss

    65hoss LawnSite Fanatic
    Messages: 6,360

    I don't have any diesels, but I run Rotella in my work truck, tractor, and one older mower. My newer truck gets Mobil 1, and all other equipment gets Opti-4 oil.

    I would think the rotella would work great in that diesel.
  6. bob

    bob LawnSite Platinum Member
    from DE
    Messages: 4,260

    I've got an 18hp Yanmar in my Gator. I use Valvoline Premium Blue 15-40. It's $1.68 at Walmart.
  7. mmathys

    mmathys LawnSite Member
    Messages: 13

    Is this an air-cooled engine? They run hotter and require special oils. I would go with what the manufacture recommends.

  8. Bunton Guy

    Bunton Guy LawnSite Bronze Member
    Messages: 1,902

    ITs liquid cooled with a fan just like a diesel truck.
  9. mmathys

    mmathys LawnSite Member
    Messages: 13

    I couldn't find anything on SAE J-300C spec. I work with oils every day and have not heard of that one. The only case I know of where they don't want you to run CG-4/CH-4 oil is for 2-Cycle diesels like Detroit 671's. Here they want CF oil. Some of the additives cause problems with these engines.

    I don't know why they wouldn't want you to run the CH-4 type oils.

  10. Bunton Guy

    Bunton Guy LawnSite Bronze Member
    Messages: 1,902

    I noticed this mower is one heck of a knock and fire motor.....it has a loud nock sounds similar to a Cummins diesel engine or a little bit like a GM diesel not a verry smoothe diesel purr like a duramax diesel truck or a powerstroke but my dealer said that the yanmar does have a loud knock and thats basically what a diesel engine is a knock and fire so I guess that is ok its just sometimes very loud on the ears in a enclosed trailer.

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