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  1. Castrol 10W 40 engine oil. Can it be used in XF ?

    Technical Discussion. Limited to regular posters.
    I have a couple of canisters of diesel version Castrol 10W 40 engine oil from my old Audi A4. Does anyone know if I can use it for my Jaguar XF diesel? I appreciate that 5w-30 has better starting in winter, so should I reserve my old stock for summer use only?