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10w-30 or just 30w

Discussion in 'Mechanic and Repair' started by thesargent, Jul 14, 2007.

  1. thesargent

    thesargent LawnSite Senior Member
    Posts: 400

    would some one please tell me what the "10" is on an oil bottle. would it be bad to use oil just marked with a 30? sorry for the lame question, but thanks for any help:)
     
  2. Turf Dawg

    Turf Dawg LawnSite Gold Member
    Posts: 3,723

    the first number is the lower viscosity for cooler weather. when starting in cooler weather it is important to use a oil with a 5 or10 in the first number. as the oil warms the viscosity will change to the last number.
     
  3. cpel2004

    cpel2004 LawnSite Bronze Member
    Posts: 1,416

    So what should I use I live in FL, straight 40 or 5,10, 15- 40. I know I can you either but what is recommend it. My manual says 40 but I cant find a straight 40. tks
     
  4. Turf Dawg

    Turf Dawg LawnSite Gold Member
    Posts: 3,723

    i would use 10 or 15w-40. it has to get pretty cold to need 5w-30
     
  5. cpel2004

    cpel2004 LawnSite Bronze Member
    Posts: 1,416

    Hey thanks that was like fast like a IM
     
  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Hmmm, No one in this thread mentioned what brand engine they were to run this oil in !!!

    Different OEM's, Different Oil Recommendations......
     
  7. cpel2004

    cpel2004 LawnSite Bronze Member
    Posts: 1,416

    kaw 23 hp air cooled, kaw 23 hp liquid cooled, 13hp air cooled kohler. tks
     
  8. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Posts: 1,164

    I would use 30wt you can get it at your local Bennett Auto under the Parts Master label, works great have used it for years with no issue.
     
  9. Mark in MD

    Mark in MD LawnSite Senior Member
    Posts: 322

    Listen to RestroRob above. He knows his stuff.

    I'd use whatever the manual says. Different engines are designed and engineered to specific oils that lubricate best with the various clearances within the engines. You can't out-guess the engineers who manufactured the engine.

    Check your manual.

    Regarding viscosity, the first number is the viscosity of the oil at cold-start. You generally want a thinner oil at cold start, so that it will flow easier as the engine is running cold. A thinner oil, when cold, will lubricate better than a thicker oil.

    The second number is the viscosity of the oil at operating temperature. You want a thicker oil when the engine gets hot because the heat will thin it. A thicker oil, when hot, will lubricate better than a thinner oil.

    An example would be 10w-30 which is a multigrade oil. It behaves like a viscosity 10 oil when cold, and behaves like a viscosity 30 oil when hot.

    SAE 30 is not a multigrade oil, so there's just one number.

    You should know that multigrade oils break down faster than regular oils (which means they need to be changed more often). This is because they have additives in them.

    Hope this helps.
     
  10. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Both the air cooled and water cooled Kawasaki's have the same oil recommendations;

    See NOTE For using multiweight oil..... I recommend the straight weight for this state.

    [​IMG]


    You want to run NOTHING but the 10W30 in the Kohler here in this state.


    [​IMG]
     

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