Changing old oil...

Discussion in 'Mechanic and Repair' started by bigz1001, May 2, 2005.

  1. bigz1001

    bigz1001 LawnSite Member
    Posts: 128

    I have heard that once you let oil go so long without changing it, that it perhaps does more harm than good to change it. Example, a Kohler 22.5hp engine with 510 hours on it has never had to oil or filter changed, just oil added as needed. Should I change this oil? What type/weight should be used? Should I just change the filter? Note: I am not the one who didn't change the oil to begin with.
     
  2. Smalltimer1

    Smalltimer1 LawnSite Bronze Member
    Posts: 1,223

    Use a non-detergent oil such as a SAE-30 ND. What happens as your engine gets older with the same oil in it, or sits for a long time, the debris in the oil will sludge up on the inside of the engine. If you change it again and put detergent oil in it, the sludge will break up and particles will go through the oil pump, bearings, and every essential part inside that engine. The non-detergent oil will allow the deposits to stay where they are, which allows you to keep running without fear of wiping out your bearings in the engine.
     
  3. thinksnow

    thinksnow LawnSite Member
    Posts: 87

    There's always the old timers way of cleaning it out. Take out half of your old oil and replace it with Kerosene. Run the engine for a couple minutes at idle, then drain it all out. If you were to buy any of the engine sludge remover/ cleaner its basically doing the same thing. I know someone going to post a response to this and tell me Im insane but it works for me. Just don't rev the engine, idle only.
     
  4. bigz1001

    bigz1001 LawnSite Member
    Posts: 128

    So you recommend changing the oil and filter, just using a non-detergent oil if I understand you correctly. At any point should I switch to an oil containing detergent? Do you recommend a series of oil changes? Or just switching to the ND and changing it at the recommended intervals?
     
  5. BZB_Helpers

    BZB_Helpers LawnSite Member
    Posts: 131

    since you have a filter on it, why dont you run a detergent oil and new filter for short intervals, multiple times. oil goes from sump to pump to filter to engine parts. unless the filter doesnt filter good you dont have to worry about ruining bearing and other engine parts.
     
  6. thinksnow

    thinksnow LawnSite Member
    Posts: 87

    makes sense to me. run a clean filter for a short time, change the filter, top off oil level.
     
  7. bigz1001

    bigz1001 LawnSite Member
    Posts: 128

    Thanks alot fellas. Any truth that it may affect the seals?
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023


    If this is a Command Series Engine you are talking about NEVER put a stright weight oil in it,You WILL have valve train problems,Drop the kerosene deal also.
    Kohler Recommends HD 10/30 in ALL Command Series Engines !!!
    JUST change the oil two or three times at 10hr. increments,That should do the trick. (and filter)



    14yr. Briggs & Stratton Master Service Technician
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  9. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,100

    I have done the kerosene deal with old Briggs "L" head engines but would be afraid to try it in a Kohler with hydro lifters. There is no telling what it would do to hydro lifters.
     
  10. Prof100

    Prof100 LawnSite Member
    from Canton
    Posts: 2

    I have never seen kerosene remove cooked-on sludge without taking the motor apart and properly cleaning everything. You're just kidding yourself if you think it will work without some mechanical effort to scrape it off.

    I, too, would not use any detergent based oil in the motor until it is torn down and properly cleaned. Those detergents will make quite a slurry inside the motor.
     

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