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Mileage just got worse! Do I really need an engine overhaul?

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  • Mileage just got worse! Do I really need an engine overhaul?

    The Surf is just becoming annoying as hell. The mileage just got worse because now I only do 120kms with 30liters of diesel. I have no idea what happened to is earlier 7km/liter usage. The only thing done to it is repair the fuel pump, injectors and nozzles in a hope it will be better. Our old 1991 Isuzu Trooper does better (8-10kms/liter).

    A garage told me that it the Surf needs an engine overhaul. And overhauling an engine here costs a lot, I mean a lot. So I just wanted your opinion first. Some problems I notice on the Surf are:
    > gray-ish smoke comes out of the when I open the engine oil cap while the engine is running,
    > the smoke is clear blue in the morning, then goes away after the car heats up (but a deep black comes out when you give it a bit more gas),
    > the car has no power when I drive it after parking in school for 7hrs (parked in blazing sun)

    So do I really need an engine overhaul?

    P.S: I am easy on the accelerator pedal and coast downhills. Plus I always stay mostly above 60km/hr.
    '94 Surf SSR-X --3.0l Turbo-KZN130W -- 400,000KMs
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