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Thread: help: throttle response lost after 30min driving

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    PakWheeler Follow
    fuma's Avatar
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    Question help: throttle response lost after 30min driving

    throttle response looses by 30-40% after 30min driving.

    How the problem begin:
    i used to have 10w30 oil in my ride, throttle & performance was all good.
    recently my mechanic told me to use 20w50 oil for hot summers,
    i was not sure about it, but still i switched over to it, to give it a try.

    Now after i found huge power lost, i flushed the 20w50 oil & put back the 10w30.
    however the problem has improved by 50%,
    but it still has that sluggish throttle after a 30min drive as it was on 20w50, what to do ?

    Vehicle:
    Pajero 2.5 Diesel Turbo 4d56
    Vehicle History: Pajero 1 & 2 (4d55 Non-Turbo - 4d56 Turbo & 4M40 I-C Turbo) / Land Cruiser BJ60(13B-T Turbo) / Nissan Patrol GQ(Td422 Non-Turbo)

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    Jeep_junkie's Avatar
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    The heavier oil is the culprit. It causes a lot of parasitic drag on the internal components of the engine. Most oils in any case are too thick at room temperature to flow properly but our mechanics don't understand these basic things. They would be pouring grease into the engine if possible LOL! You're best off following the manufacturer's recommendations. You don't need anything heavier than 15w40 in your diesel engine. It will take another oil change to get rid of the residual 20w50 that's left in the engine. 10w30 is typically not suitable for diesel engines.

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