Why oil change is important in car and after how long I have to change engine oil?

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  • 6 months ago
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    Oil gets dirty and breaks down.

    It gets dirty because as your engine wears, powdered steel is rubbed off the parts that touch each other. The oil filter catches most of it but some stays in the oil. It increases friction so it makes the engine wear out faster. So you want to put in fresh, clean new oil before too much of that stuff accumulates in your oil.

    And oil breaks down. The molecules that do the lubricating break down into smaller, simpler molecules that don't contribute to lubrication. So it just doesn't do as good a job. This accelerates wear, which rubs off more steel, which accelerates wear even more.

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    • Lv 4
      6 months agoReport

      good answer & gracious comment;also, in addition to changing the oil filter,completely draining the oil drains out debris which is in the bottom of the engine; always use Correct Weight top quality oil & oil filter,& change at the same time, about every three thousand miles/ five thousand km is good

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  • 6 months ago

    Oil gets contaminated after a few thousand miles. Moisture from condensation, gasses from the combustion, dirt, small fragments of metal from normal engine wear, and so on. If not changed regularly, the dirt and metal fragments cause accelerated engine wear. Also, with all this contamination, the oil isn't lubricating things like it should.

    The oil filter can't catch everything.

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  • Anonymous
    6 months ago

    Drive without it and you'll find out for yourself.

    • Hi-Tech6 months agoReport

      If your car not have engine oil how you can drive then..

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  • 6 months ago

    Oil changes are important because if you on't change the oil and filter every 3,000 miles or every 5,000 miles when using synthetic oil the motor will start burning oil because the piston rings get seized up and next the bearings get worn and you lose oil pressure which results in the motor seizing up.

    Source(s): Mitsubishi Master Tech
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  • 6 months ago

    Oil change is beneficial for the longevity of the engine.

    We don't know what car you own so oil change varies.

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