How much oil useage is "acceptable" (25hp. Kohler)

Discussion in 'Mechanic and Repair' started by Jason Rose, Jun 15, 2007.

  1. Jason Rose

    Jason Rose LawnSite Fanatic
    Posts: 5,858

    THe 25hp Kohler on my Dixon has been using oil for some time now, I noticed it using quite a bit at around about 200 hours, but of course I didn't take it in...

    Well now I have 900 hours on it and for the last several hundred Iv'e been adding oil about every other day, usually 8 to 10 ounces at a time! The engine dosn't visibly smoke other than at start-up sometimes. The exhaust does smell strong at times too.

    Anyway, I had the machine at the dealer to get a couple things fixed and I asked them to check it and told them how much oil it was using. I was told it was totally NORMAL! "Every engine is different" he kept telling me when I explained that I have had about 6- 22 to 25hp engined over the years and NONE have used this much oil. Even my backup machine with 2500 hours dosn't burn this much oil.

    They did a "leak down" test and found that I have one intake valve leaking slightly, but everything else was within specs. He said that the intake valve wouldn't account for that much oil useage, but then told me again that "it's normal".

    Engine warranty wouldn't cover any repairs at this point so I told them to just forget the rebuild and I'd keep dumping in oil till winter and then decide what to do. I was using mobile1 syn. from 50 hours up till about 800, but frankly I'm tired of spending that much $$ on oil that's just dissapearing! I just swiched back to cheapo 10w30.

    Any opinions? Thanks! :dizzy:
     
  2. mcambrose

    mcambrose LawnSite Senior Member
    Posts: 510

    Kohler says 1 ounce per hour. I don't know if this is on a per cylinder basis or total for two cylinder. Either way that is a lot of oil.
     
  3. Jason Rose

    Jason Rose LawnSite Fanatic
    Posts: 5,858

    1 ounce per hour? wow! Well if that's the case then it really isn't that big of a deal, considering that I'm logging 8 to 10 hours every 2 days, and oddly I'm adding 8 to 10 ounces of oil every 2 days. Wonder why all my others were so much tighter though?
     
  4. haybaler

    haybaler LawnSite Senior Member
    from ma
    Posts: 511

    I always thought Kohler were good engines, but I'm changing my opinion quickly. My 23 hp is already blowing smoke at startup at 50 hr's! my Kawasaki didn't start doing that until 750 hr's.
     
  5. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 910

    I think that considering it's a 25 HP engine, 1 oz./hr. wouldn't be considered "excessive". Maybe not desirable, but....
     
  6. Jason Rose

    Jason Rose LawnSite Fanatic
    Posts: 5,858

    I'm going to start using Valvoline "maxlife" oil in it (10W30). Don't know why that didn't occur to me a while back...

    Iv'e had several vehicles in the past that started using oil, including my '98 dodge. Every one that I started using that Max Life oil in STOPED using oil! Supposedly it has some special additives in it that soften seals to make them more plyable again etc. I can tell you first hand that it DOES work, at least in my trucks. As for small engines, I guess I will find out.

    The other PROBLEM I have with this engine is that it's hard as hell to start when it's hot! I can SMELL the excess fuel that has flooded the carb. once it does start. I told the mechanic about this 2 times now and he says "there's nothing wrong, it runs fine". Well the problem is that it's in his cool shop and the engine hasn't been running for an hour+ when he's checking it. I have to crank and crank and crank on the starter when it's hot to get it to fire. Drives me nuts! (Iv'e tried new plugs too, no help) I'd love to just adjust the carb a bit leaner and see what it does... But where in the heck is the adjustment screws??? Or is there any??
     
  7. haybaler

    haybaler LawnSite Senior Member
    from ma
    Posts: 511

    first of all, lawn mower and car motors are totally different. two main things are mowers only run in warm weather and at a constant rpm. Don't use a multy viscosity oil. run straight 30w oil. if the temp is below 50f in the morning just let the mower warm up for a minute. Make sure after the first time U start the motor DON'T use the choke. Kawasaki's need the choke almost every time to start and Kohlers rarely ever and the do flood out easily. I wouldn't adjust the carb, bring it to the dealer. most carbs now you actually have to drill a hole in the right place to get to the screws, and you'll notice all the 2 cycle carbs have stops on the adjusters so you can't mess it up. so many engines have been ruined by people messing with the adjustments and not knowing what there doing. Even 4 stroke motors can be ruined by running to lean.
     
  8. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 910

    "Don't use a multy viscosity oil. run straight 30w oil."
    For Kohlers with their hydraulic lifters, that statement is WRONG!
    Using a straight weight oil can result in problems with the lifters.
     
  9. Jason Rose

    Jason Rose LawnSite Fanatic
    Posts: 5,858

    Thank you. I was going to say something but was busy at the time I looked at this tread earlier...

    Yes, with Kohler engines it's best to use 10W30 ONLY. However Iv'e talked to people that use nothing but 15W40 in everything (for ease of servicing equipment, one oil for everything, gas or diesel). I thought I'd give it a shot a month 'n a half or so ago. Believe it or not, the engine was running FINE when I changed the oil, and the day after, and from there on out, untill I changed the oil again back to 10W30, it ran HORRIBLE!!! I'm unclear how a slightly different oil could make the engine run BAD, but it sure seems to me that it did. It was stalling at idle, backfiring at full throttle while mowing, loosing power/bogging down for no reason, etc. I checked fuel filter and changed the plugs, no difference. Couldn't have been the fuel as I had ran many many gallons through it in that time, all from different fuelings. Changed the oil and it ran fine again... wierd!:dizzy:
     
  10. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 910

    You shouldn't have turned it upside down to drain the oil:laugh:
     

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