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Oil change MASSIVE LEAK!!

This is a discussion on Oil change MASSIVE LEAK!! within the CLA Maintenance / Care / Detailing forums, part of the Mercedes-Benz CLA Forum category; Hello fellow benz owners, I had recently purchased a 2015 Mercedes CLA 250, and had driven it about 500-600 km as then I had received ...

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Thread: Oil change MASSIVE LEAK!!

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    Newbie amitd7's Avatar
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    Oil change MASSIVE LEAK!!

    Hello fellow benz owners,

    I had recently purchased a 2015 Mercedes CLA 250, and had driven it about 500-600 km as then I had received the notification of change oil on the dash.

    Reading throughout these forums and watching a lot of videos of the oil change I had thought i known what to do. I had done the following

    1. Take off splash guard
    2. Take off engine oil and dipstick
    3. Used a 13mm to unplug the drain plug
    4. I let the oil drain into a pan (i disposed of this oil at a canadian tire)
    5. I unscrewed the oil filter and removed the 3 gaskets and old filter and lubricated heavily the 3 gaskets and put them in their corresponding spots & put the new filter in
    6. I screwed on the oil filter
    7. Put drain plug back with the washer that was there
    8. Put new oil in the car castrol 5-30w
    9. I started up the car and went to see for leaks.....

    At step 9 is where the issue came.. (please see photos) the oil is leaking HEAVILY , not drips, but HEAVY HEAVY leaks once the car starts and only stops when I turn off the car. It is leaking BEHIND where I unscrewed the drain plug like behind the drain pan.. I didn't unscrew ANYTHING behind there or anything close to it. I even checked my drain plug if that was the problem of the leak and it is NOT. NO oil comes from the drain plug when I tighten it but it comes from behind the drain pan area like behind the silver box holding all the oil...

    Could anyone please throw any help my way..? This was my first and only car I have and its been out of service for 2 weeks.. I was ashamed to ask for help as everyone said changing oil is such an easy thing but I have no other option to resort to here... please leave any comments or feedback on how to fix this :/Name:  IMG-2482.JPG
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    jmc
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    5-30 may not be ideal for the turbo ... but anyway

    - what torque on drain plug?
    - which direction was filter put back?
    - was dipstick out when pouring oil back?
    - how quickly was oil poured back?
    - what torque on oil filter cover?

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    Newbie amitd7's Avatar
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    Quote Originally Posted by jmc View Post
    5-30 may not be ideal for the turbo ... but anyway

    - what torque on drain plug?
    - which direction was filter put back?
    - was dipstick out when pouring oil back?
    - how quickly was oil poured back?
    - what torque on oil filter cover?

    1. Did not torque drain plug (when the leak occurred it was not leaking from there)
    2. The filter piece itself like the fabric thing only went on a certain direction so I know that was correct, and I first put it onto the piece that holds it and twisted it to the right (to tighten it)
    3. Dipstick was put back in before putting oil
    4. I put the oil in as fast as I can, used a funnel
    5. Did not torque that either, but I made sure it was really really really really tight like I tightened it the maximum I could

    Ps. Thanks for your help ❤️

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    jmc
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    Oh boy
    3 and 4 may have caused oil to go where it should not ... dipstick needs to be out (as a vent) and oil goes in slowly (to avoid flow back)
    If you over torqued the filter housing it may have cracked ... its only polymer

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    ...and you also may have added too much oil.
    I took European Delivery and drove through four countries in my limited edition Universe Blue CLA 250.

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    Newbie amitd7's Avatar
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    Quote Originally Posted by jmc View Post
    Oh boy
    3 and 4 may have caused oil to go where it should not ... dipstick needs to be out (as a vent) and oil goes in slowly (to avoid flow back)
    If you over torqued the filter housing it may have cracked ... its only polymer
    Should I remove the oil filter and see if it cracked or anything? Im not a mechanic or anything but would you know how to check for cracks/where?

    the oil was going in decently though, like I would let the funnel fill up and stop for a bit until empty and re-do... but I do honestly think it has to be the oil filter not being torqued or being tightened to a point of no return...

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    Newbie amitd7's Avatar
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    Quote Originally Posted by 2katman2 View Post
    ...and you also may have added too much oil.
    That would be the last thing boss.. the car takes 5.9 I added about only 5 and dipstick seemed okay so to see for leaks (not waste any oil) I started the car with about 5.5 L.. and the leak caused chaos.. its leaking from behind the drain pan.

    Is there perhaps a drain plug located elsewhere that may have come loose? or is there only 1 drain plug in the front ?

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    jmc
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    Consider cleaning everything ... start ... and look for leak source

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    Engine oil must be added slowly for M270 engines as stipulated in Mercedes WIS. Attached useful torque valves of bolts during engine oil change.

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    jmc
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    @werks400
    Yup! Just wish there would be little “?” markers to click and pop up more useful details like “pour oil in slowly to avoid cavitation and transferring oil into intake channels” or “dont over torque lest the thermoplastic housing gets damaged”
    I mean geewhiz ...

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