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Changing oil question, mixing oils

  • 27-06-2021 8:06pm
    #1
    Braxton Spicy Gunshot
    Posts: 4,186 ✭✭✭ Braxton Spicy Gunshot


    Hey,

    I have an old beater of a 1.2 litre 2002 VW polo I use as a runaround, I change the oil usually every 8k miles.

    It needs to be changed and I have 2 litres left of 5w-30 that I used for its last oil change and I also have a spare 2.5 litres of 10w-40 4 stroke motorcycle oil.

    Would it be ok to mix them and do a full oil change, I think 4.5 litres should more than cover it?

    Reading online it's says motorcycle oil is basically just more expensive car oil and it should do no harm putting it in a car engine so I suppose the main question is the harm that mixing two different viscosity oils would do?

    I know on older cars many people use thicker oil anyway so I would probably end up with an oil that's 7.5w - 35 if I mix them

    Obviously I would never do this in a car worth any significant value or a newer car but if I don't use the 10w 40 oil up it will just end up being recycled by the dump so I would prefer to make use of it


    Thoughts?


Comments

  • #2
    Braxton Spicy Gunshot
    Posts: 4,186 ✭✭✭ Braxton Spicy Gunshot


    Doing alot of research online this doesn't seem to matter at all mixing oils and brands ,just scaremongering by oil industry so no reply needed.

    IL post a thread if the engine blows up lol

    Thanks
    Dave


  • #3
    Whocare
    Registered Users, Registered Users 2 Posts: 1,218 ✭✭✭Whocare


    Probably make no difference .but if had car with dpf I personally not mix oil


  • #4
    mickuhaha
    Registered Users, Registered Users 2 Posts: 475 ✭✭mickuhaha


    Once the oil in in spec you can mix what ever oil you like. The oil bottle should list the standards and just check against your manual


  • #5
    Cee-Jay-Cee
    Registered Users, Registered Users 2 Posts: 12,235 ✭✭✭✭Cee-Jay-Cee


    Why would you bother, 5 litres of oil is around €25, just buy the correct oil for your car.


  • #6
    Braxton Spicy Gunshot
    Posts: 4,186 ✭✭✭ Braxton Spicy Gunshot


    Cee-Jay-Cee wrote: »
    Why would you bother, 5 litres of oil is around €25, just buy the correct oil for your car.


    Because I have oil lying around and I don't want it to go to waste from an environmental point, nothing to do with cost. It's done now anyway, running a treat.

    It is the correct oil, the car can take 5w-30 or 10w-40 , I just combined the two.


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