Why the oil is decreasing in the engine, I have to refill the oil monthly

  • How much do you have to put in each month? This could be normal for that machine, have you checked the handbook or with the garage or the dealer? Is it new or ancient?
    – Solar Mike
    Jan 22, 2019 at 7:05
  • We really need more information about the bike - make, model, age and mileage at a minimum really. Jan 22, 2019 at 12:55

1 Answer 1


Most motorcycles use oil over time and it's normal, especially as the bike gets miles on it. You didn't say how much it uses or how many actual miles were ridden, but in 1500 miles a quart isn't bad....you actually need to change your oil in 2500-3000 miles anyway. Try using synthetic oil (I prefer Amsoil)....you may have better performance with a high grade oil.

  • 2
    You guys must own Harley's, because normal well engineered motorcycles don't noticeably lose oil. Certainly not a quart a month. If you're adding a quart of oil to your bike every month, then you've got a leak (or POS). Oct 21, 2019 at 20:13
  • @JoshCampbell agreed. Even if I was on a 15 year old honda burning a quart of oil a month seems crazy.
    – rob
    Jun 7, 2022 at 19:59
  • And we don't even know if the engine is using oil, or dripping it out the bottom of the sump. Sep 30, 2023 at 21:24

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .