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    The dipstick is blowing out in my 2022 Hyundai Tucson diesel

    Hyundai Hyundai Advice Hyundai Tucson Hyundai Tucson Advice Hyundai Tucson 2022
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    Have a 2022 Hyundai Tucson diesel with 45,000km. The dipstick is blowing out when driving and there is oil everywhere under the bonnet

    Answered by CarsGuide
    24 January 2025
    David Morley

    It sounds very much like there’s a blow-by problem with this engine. The pressure created by the combustion process is somehow getting past the pistons and into the crankcase, causing the dipstick to leave its tube and blowing oil all around the engine bay.

    Blow-by is often caused by worn or broken piston rings or a damaged piston itself. But modern turbo-diesels are also prone to problems with their crankcase ventilation and emissions-control systems which can become full of gunk and not allow the crankcase to breathe properly. At which point, the same symptoms can occur.

    A mechanic will be able to do some tests and determine what’s causing the pressure build-up inside the crankcase. If it’s internal wear, a rebuild may be required. But if it’s a build-up of crud inside the emissions-control systems, a manual disassembly and clean might be required. Either way, your car’s warranty might cover you for this, so the Hyundai dealer is your first port of call.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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