Changing Oil without Filter change
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This is a discussion on Changing Oil without Filter change within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Changed my oil around 2500 miles with Mobil 5w-30 along with a OEM Filter. Did a second oil change around ...

  1. #1
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    Changing Oil without Filter change

    Changed my oil around 2500 miles with Mobil 5w-30 along with a OEM Filter.
    Did a second oil change around 5500 miles but could not remove the oil filter due to lack of daytime light and could not get a good grip on the filter.
    So i decided to leave the filter on and simply refil the oil as needed.

    I do understand that both dirty and clean oil will mix and that the oil filter is still dirty and has less capability to filter contaminents from the oil

    What I am worried about is if I created any pressure differences or pockets of air or anything harmful from this situation.

    Can somebody confirm that this is nothing harmful or if it is.

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  3. #2
    He simply abides. SD_GR's Avatar
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    As long as insolubles stay within reasonable levels there is no problem leaving a filter in. Some car companies do not require a filter change with every oil change.

    The only problem you've created is with your warranty documentation, since Subaru does require a filter change with the oil change.

    Since your motor is new I"d just buy a filter and put it on during daylight. Keep all your receipts for your records for warranty purposes.
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