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I have an 01 mustang gt . Two days ago I checked the oil level in the dipstick when my car was warm and it was way above the maximum level . I parked it and checked it again today the oil level was below the minimum with no mejor clicking noise in the engine . What is going one with my car ? Do I have a bad oil pump ? Or is it because of the oil sending unit?

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    Was the engine running/not during one or the other of these checks? You said it was warm one day, and then nothing about temp the next. What's the story? – spectre6000 Aug 25 '15 at 22:23
  • Well .the first day when I checked the engine was warm . But the second check when it was below the minimum level was not running and cold. And I've just checked it few minutes ago when the engine off was below the minimum so I turned the ignition on and checked again ,the oil was above the maximum level . – Moh Aug 25 '15 at 22:44
  • Answer below. Please accept if you feel it sufficiently resolves the issue. – spectre6000 Aug 25 '15 at 23:04
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Many dip sticks will have lines on one side for cold and the other for hot, and occasionally both will be on the same side. If the different marks are not available, refer to owners' manual for the temperature being indicated.

Regardless, check your oil with the engine off. When the engine is running, oil fills galleys, pumps, etc. and is moving around in the sump. This can lead to all sorts of anomalous readings.

The differing temperatures will have a bearing on your readings, but more than anything it's that you're checking with the engine in various states of non/operation.

If you have too little oil in the engine, this can obviously lead to oil starvation, etc. If you have too much, you can create an entirely different set of issues: shearing, windage, high oil pressure (which can burst lines and fittings), etc. Refer to your manual for proper lubrication in terms of the type/weight of oil, intervals, procedures, etc.

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A few points worth mentioning when checking oil level:

  • Never rely on the first reading, especially when the engine has just been run

    Always take out the dipstick and wipe it clean with a rag before reinserting the dipstick to check the level.

  • Never take readings with the engine running

    The dipstick level markings are supposed to be used with the engine off.

  • Some engines need to be warmed up, others left cold

    The owner's manual will usually clarify under which conditions the reading should be taken.

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