10W30 full synthetic in a diesel?

Discussion in 'Lawn Mowing' started by Bunton Guy, Apr 6, 2004.

  1. Bunton Guy

    Bunton Guy LawnSite Bronze Member
    Messages: 1,909

    Is this oil to thin to use in a V-twin Diesel mower engine? I used normally 15W40 rotella and changed oil every 50 hours. Im planning on running the full synthetic oil in the mower for most of the season 200-250hours. Without a change. It looks kinda thin....from a chemical makeup standpoint is this a bad thing?
  2. jsr2741

    jsr2741 LawnSite Senior Member
    Messages: 392

    Shouldn't have a problem, probably will run cooler too. Call your mechanic and see what he says.

    I run Rotella 5w-40 Synthetic in my truck and so far no problems.
  3. Doster's L & L

    Doster's L & L LawnSite Senior Member
    Messages: 616

    Just my 2 cents....
    The diesel engine oil has more of the added "chemicals", for lack of a better word, than the gas engine oil does. Look on the back of a diesel oil container and the same with the gas engine oil. You'll see the circle with what all it has passed in testing. The gas oil will be approved for: API Service SL/CF. The diesel, on the other hand is approved for: API services Cl-4, CG-4, and SL.

    I think i'd keep using the diesel oil with the diesel and the gas oil for the gas engine.
  4. A1 Grass

    A1 Grass LawnSite Senior Member
    Messages: 330

    2 more cents:

    I use Chevron Delo 15/40 and I installed a Frantz Bypass filter (toilet paper element) about 2 months ago. I have about 2500 miles on the oil and it's as clean as the day I put it in. If you want clean oil ALL the time, check out the Frantz. I believe they have them at www.wefilterit.com.

    1992 Dodge D250 Cummins Turbo Diesel.
  5. Bunton Guy

    Bunton Guy LawnSite Bronze Member
    Messages: 1,909

    by the way the 10W30 that was installed was Mobil one full synthetic and on the back it said good for use in turbo cars and diesels...now this isnt a turbo diesel but it is a diesel run under lesser conditions.
  6. Bunton Guy

    Bunton Guy LawnSite Bronze Member
    Messages: 1,909

    When I went to the parts store my intentions where to buy a full synthetic 15W40...but they didnt carry it anymore because it didnt sell very well. I checked several stores with the same story so next time I will order some Amsoil 15W40 but for this season I think I will just leave the 10W30 in it for the complete season as that was my intentions.
  7. Ray&Christine

    Ray&Christine LawnSite Member
    Messages: 181

    For the last year I used Castol Syntec full 10W-30 synthetic in our Kubota tractor for the last year. It was one of few synthetic oils I found with the CF rating on the jug, I think that is what the owners manual recommends. So far it seems to work fine but the tractor is not used very hard and we only put about 40 hours a year on it.
  8. Movinfr8

    Movinfr8 LawnSite Member
    Messages: 178

    I use a Gulf coast filters bypass filter. Very similar to Frantz, uses toilet paper. Haven't changed my truck's oil since April 2002, about 35,000 miles ago!!

    I DO, however change the filter element and add a quart of Mobil 1 10-30 every 2,000 miles or so.
  9. marvinlee

    marvinlee LawnSite Member
    from Oregon
    Messages: 108

    I use Mobil Delvac 5-40 diesel engine oil in the Kubota ZD-21. The Delvac is formulated primarily for diesel engine use, though it will function fine in a gasoline engine. The Mobil1, which I use in my car, is formulated mostly for gasoline engines, though it is usable onsome, not all, diesel engines. Beware: Delvac 1 is costly!

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