Author [NL] [FR] [ES] [DE] [SE] [IT] Engine oil change while engine is hot?  (Read 3681 times)

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  • Offline kokkios   cy

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    Engine oil change while engine is hot?
    on: Jun 22, 2020, 01.38 pm
    Jun 22, 2020, 01.38 pm
    As in the title... is it ok from a mechanical perspective (not the persons safety handling hot fluids), to make an oil change when the engine is hot? Some HD mechanic once said it can cause a problem so i had to sit and wait for 20-30 minutes for the engine to cool a bit

  • Offline Derchef1962   de

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    Re: Engine oil change while engine is hot?
    Reply #1 on: Jun 22, 2020, 02.29 pm
    Jun 22, 2020, 02.29 pm
    only reason I know not to change oil on a hot engine is what you mention: dangerous for the mechanic, not for the mechanism
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  • Online Stevie.P   gb

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    Re: Engine oil change while engine is hot?
    Reply #2 on: Jun 22, 2020, 02.33 pm
    Jun 22, 2020, 02.33 pm
    *Originally Posted by kokkios [+]
    ... wait for 20-30 minutes for the engine to cool a bit

    He got that bit right and that is purely for the convenience of the mech to reduce the chance of burning himself on the exhaust, getting a blister on his fingers or burning himself with the hot oil .. additional heat related risks obviously.

    Just as we hated having to go straight in to the engine room of a locomotive straight out of traffic and at full temperature, like being in an oven, and having to disconnect for an engine change. A large diesel engine can take 24hrs to cool right down and most often wasn't an option. :233:

    I have no problem dropping the oil when hot but then leave it draining and engine cooling while I do some other tasks before putting the plug and fresh oil back in. :028:
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  • Offline Djairouks   ch

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    Re: Engine oil change while engine is hot?
    Reply #3 on: Jun 22, 2020, 02.41 pm
    Jun 22, 2020, 02.41 pm
    What is certain, is oil viscosity when hot makes it easier to drain the circuit completely. But yeah just not fish and chips frying warm  :008:, so you don't burn your hand.

  • Offline KildareMan   ie

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    Re: Engine oil change while engine is hot?
    Reply #4 on: Jun 22, 2020, 02.42 pm
    Jun 22, 2020, 02.42 pm
     :0461:  :460:

    Hotter the better as far as I'm concerned. Nice and runny so better chance of getting more out. No damage as nothing moving and as metal cools it contracts.
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  • Offline kokkios   cy

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    Re: Engine oil change while engine is hot?
    Reply #5 on: Jun 22, 2020, 04.21 pm
    Jun 22, 2020, 04.21 pm
    Great! thank you all for clearing this out for me!

  • Offline Pilotegp46   fr

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    Re: Engine oil change while engine is hot?
    Reply #6 on: Nov 26, 2023, 11.19 am
    Nov 26, 2023, 11.19 am
    Hello.
    Find below a good topic showing the way to proceed.
    i=ryLd3OzMiCry3KQL

  • Offline awjdthumper   gb

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    Re: Engine oil change while engine is hot?
    Reply #7 on: Nov 26, 2023, 01.01 pm
    Nov 26, 2023, 01.01 pm
    I always change engine oil when its hot for 2 main reasons. The first is that the oil will be thinner and hence will drain out of the engine more quickly especially from out of the way places within the engine. The second is that it ensures that all the contaminants are still in suspension within the oil rather than having been given time to sediment out after the engine stops although modern oils tend to avoid the need for this.
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  • Offline Pilotegp46   fr

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    Re: Engine oil change while engine is hot?
    Reply #8 on: Dec 02, 2023, 05.35 pm
    Dec 02, 2023, 05.35 pm
    Exactly  :762:

  • Offline AndrewNZ   nz

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    Re: Engine oil change while engine is hot?
    Reply #9 on: Dec 03, 2023, 11.56 pm
    Dec 03, 2023, 11.56 pm
    *Originally Posted by awjdthumper [+]
    I always change engine oil when its hot for 2 main reasons. The first is that the oil will be thinner and hence will drain out of the engine more quickly especially from out of the way places within the engine. The second is that it ensures that all the contaminants are still in suspension within the oil rather than having been given time to sediment out after the engine stops although modern oils tend to avoid the need for this.

    Quite!
    Never change oil on a cold engine it'll also help cool a hot one quicker.
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