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Thread: Small bubbles in engine oil dipstick

                  
   
   
  1. #1

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    Small bubbles in engine oil dipstick

    A day before when engine was hot, just to check the oil condition i opened the dip stick and found small bubbles, is this common? Car is running good with no issues, Radiator running fine, Coolant is normal level, everything as usual. Please tell me is small air bubbles common on dipstick when engine is hot. By the way the engine oil was replaced 3.5k km back only.

  2. #2
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    If the engine oil check when cool does not show any abnormality this is okay. When engine is running the constant oil splash in the sump is cause of these bubbles.

  3. #3
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    There's a chance that oil was filled beyond max level. Can you post macro pictures of the bubbles?

  4. #4
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    Check the oil level when cold and while parked on a level surface. If the level is within acceptable limits then everything's fine. Bubbles you saw when the engine was hot is also fine. If the level is more than recommended then the bubbles you saw is because of excessive splashing and frothing. If the level is too much above the max permissible level then itís wise to drain some off.

  5. #5
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    The bubbles you see may be the result of foaming. Usually lubricating oils have additives to prevent foaming. What grade of oil (SC, SD, SE, SF etc) was used last time is important to assess. Some garages use diesel as flushing media and if not properly drained could cause foaming. Check in cold condition and anyhow better to have a drain and refill with a proper lube.

  6. #6
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    Chances are
    1) Water pump might have packed up
    2) Engine oil levels are down
    While the 1) point might be the actual reason.
    You start getting that light bearing noise, if the water pump is gone.

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