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Thread: Difference between diesel and petrol oil?

  
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    dbenson's Avatar
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    Difference between diesel and petrol oil?

    What's the difference between the two if they are the same grade?

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    Very simply the three main areas are:
    Higher dispersancy to deal with higher levels of soot
    Higher detergency levels to minimise depositing on components and as a result a higher TBN which will minimise the risk of Sulphuric Acid formation from diesel dilution.
    Diesel engine oils, as compared to petrol oils, do not have very good low temperature sludge formation resistance.

    Diesel oils are useable in petrol engines, but if signs of low temperature sludge formation are seen, then switch back.

    Petrol engine oils are not suitable for diesel engines in the long term because of the lack of detergency/dispersancy predominant in a diesel, and also a lack of high temp sludge formation.

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    Think I might just top the oil up with diesel oil then don't have any petrol oil in the house

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