2022 Diesel Reliability an Issue?

Waltervp on 04/03/2022 - 00:13

I have owned diesel Peugeots that I've loved, a 307 and 2 x 407. Then I had a Ford Mondeo diesel. Loved them all. Now I've got a petrol md mondeo (2015) and want to upgrade to a 2017/8 similar one and want to go back to diesel for better mileage (5.8 vs 8.5 l/100km I believe). A friend swears his mechanic mate says all passenger brand diesels are always in the work shop. Serious?

I read "As turbocharging evolved, the modern turbo petrol engine started to deliver exactly the same driving benefits of a diesel engine, while still achieving real-world fuel efficiency".

This doesn't agree with the figures I read and experienced. Maybe in Europe with better petrol??? This was from drive.com.au.

Diesel particulate filters are not an issue for me as I do plenty of highway miles. But only do 20k pa. On average.

What's the latest thought out there? I only found postings of 2yr+ in forum so thought I'd bring it up again…

Poll Options expired

  • 0
    Little difference in running cost/ reliability for either.
  • 3
    Petrol cheapest and most reliable overall
  • 30
    Modern (2015-2022) passenger diesel reliability is fine for 20k+ pa..
Automotive

Comments

  • altomic on 04/03/2022 - 00:25
    +1

    my diesel has been in the workshop twice in the last 9 years (aside from servicing) and both time for split turbo hoses.

    literally a 10 minute hose replacement -which If I had have known what was wrong with my car then i would have DIY'd

  • nephilim on 04/03/2022 - 00:27

    VW Golf 103(kw)TDI at 5.3l/100km vs Swift Sport 103Kw 6/100km
    Can see not that much difference

    • Bypass on 04/03/2022 - 02:46

      Swift sport is a class below a Golf, more comparable to a VW Polo

  • Euphemistic on 04/03/2022 - 07:00
    +6

    Sounds like you turn over your vehicles relatively often. You do Highway kms for the DPF regen. Diesel shouldn’t be a problem.

    IN my untrained (except by internets) opinion modern diesel is OK if you regularly do highway kms and keep it serviced. Should have no significant problems up to 300,000km.

  • pegaxs on 04/03/2022 - 07:47
    +4

    Lots of highway km, go a diesel. And 20k per year is well above the average distance for vehicles per year. The only thing I can’t stress enough as a diesel mechanic is “get it serviced”. Diesels don’t like missing services or going too long over their service interval.

    As for your mechanic, he is not telling you the whole story. Of all these diesels he is seeing, what is the main or common issue? What brands are they? What are their drive cycles? What is their service history? They are not at workshop being repaired because they are diesels, but because of poor maintenance or wrong application.

    • Euphemistic on 04/03/2022 - 08:38

      Simply saying ‘all brands of passenger vehicles are in the workshop’ doesn’t mean much at all. Agree that is most likely means the least serviced vehicles keep turning up. Fleet vehicles get regularly serviced, and generally keep going for a long time. Private vehicles often get servicing missed because ‘I can’t afford it’ or ‘it’s running fine, why bother’.

      People say that my model ute is rubbish and they’d never buy one because ‘list of problems’. Then I look around and see dozens daily. Can’t be all that bad.

    • netjock on 04/03/2022 - 10:42

      Lots of highway km, go a diesel. And 20k per year is well above the average distance for vehicles per year.

      Get a 2019 Corolla Hybrid Sedan. It is about the same size. 3.5L/100kms, got active cruise. 1100km+ a tank on E10. Could cruise all day. $205 per service, 12 months or 15k/kms.

      • brendanm on 04/03/2022 - 18:31

        Hybrids do much better around town than on the highway.

        • netjock on 04/03/2022 - 20:58
          +1

          https://www.greenvehicleguide.gov.au

          States: 3.4L urban and 3.6L extra urban. For Corolla sedan.

          I have a photo of 3.5L after 400km run from Melbourne to the country. Mostly urban I am averaging 3.7L.

          Toyota states 3.6L but it doesn't break down urban and extra urban. 3.6L is excellent fuel economy for long distance runs.

          I have not seen much difference between E10 or ULP.

  • DJR9000 on 04/03/2022 - 08:03

    maybe mechanic mate works in an area with lots of diesels or for a workshop that specialises in them?

    • bdl on 04/03/2022 - 09:20
      +2

      or doesn't know how to fix them, that's why they keep on coming back :)

      • pegaxs on 04/03/2022 - 10:32

        Or doesn’t understand them/has limited experience with them, ergo, all of them are shit.

    • netjock on 04/03/2022 - 10:44
      +1

      Asking mechanic is like asking a cop about crime. Everyone only comes in when there is a problem.

  • Muzeeb on 04/03/2022 - 09:26

    I have a diesel engined 1962 tractor and she runs a treat. Change the oil every season and she keeps puffing along.

    She's a lot simpler than a modern diesel car though.

  • JimmyF on 04/03/2022 - 09:32
    -1

    go back to diesel for better mileage (5.8 vs 8.5 l/100km I believe

    Is it really cheaper? Often Diesel costs most per litre.

    Diesel particulate filters are not an issue for me

    and what about the particulates flying out the exhaust pipes for everyone else?

    Even EU is moving away from diesels.

    • Brian McGee on 04/03/2022 - 09:55
      +1

      Diesel particulate filters are not an issue for me

      and what about the particulates flying out the exhaust pipes for everyone else?

      Pretty sure they are saying the blocking up issues most diesel city vehicles suffer from, not deleting the system.

    • netjock on 04/03/2022 - 10:44

      Even EU is moving away from diesels.

      We're 20 years behind.

    • Euphemistic on 04/03/2022 - 19:51

      Is it really cheaper? Often Diesel costs most per litre.

      I’d say diesel has been cheaper the ULP locally for the past few years with the occasional exception, not petrol being cheaper on average. The other thing is that diesel doesn’t have the price cycles that petrol does. It stays pretty consistent.

  • pharkurnell on 04/03/2022 - 10:10
    +5

    I couldnt get past "I have owned diesel Peugeots that I've loved"

    • jackary on 04/03/2022 - 10:21
      +1

      Thought it was a nubzy post

      • pegaxs on 04/03/2022 - 10:35
        +1

        Same, I got to the Peugeot part and was about to start abusing my keyboard, looked at the username… oh. Keyboard gets a rest today.

        Either way, InB4; nubzy turns up and tells everyone how Peugeot diesels are the best on the market and how they have won Diesel engine of the year, 67 years in a row… and how he gets 200km/litre in his 406.

        • brendanm on 04/03/2022 - 18:32

          how he gets 200km/litre in his 406

          Mine actually makes diesel as I drive, then I sell it to the neighbours. Try that in any non french car.

        • Euphemistic on 04/03/2022 - 19:57

          Growing up, friends (farmers) always had diesel Peugeot’s. Never had an issue, always comfortable ‘luxury’. But, always serviced. He was renowned for being late to get away for family holidays because he’d be changing the oil beforehand.

          They wanted a diesel sedan because they could refuel from farm tanks at farm rates.

          This was a long while ago before there was loss if electronics in the engine bay.

  • dtc on 04/03/2022 - 10:21
    +1

    DPFs have issues, there is no denying it. When the system works and does a DPF burn off as needed, they are fine. But when something goes wrong with the system you wont know, until your engine fails. If you drive a diesel in the city, DPF risks increase dramatically. If you are driving regular long distances, not so much a problem

    Probably what your mechanic is talking about

    oh, and adblue shortages. But they are probably resolved more or less

    As to saving, you need to compare price not just l/100km. At the moment diesel is price about the same as 91, so a saving over most turbo charged cars which use 95 or 98. But it often can be higher

    Also, of course, initial purchase price. However if you are after a 2nd hand mondeo then you will likely be getting a pretty good value car - its a good car and not well loved, so second hand bargain

    • Typical16-bitEnjoyer on 04/03/2022 - 11:31

      Denying it. Nearly all modern diesels have manual and/or auto DPF burns.

      • dtc on 04/03/2022 - 15:08

        I mean I literally said

        When the system works and does a DPF burn off as needed, they are fine.

        So I'm not sure of your point. There are plenty of examples (and Mondeo in particular) of the DPF burn not working as its meant to.

    • brendanm on 04/03/2022 - 18:33

      But when something goes wrong with the system you wont know, until your engine fails.

      Lol, the dpf light comes on, and power is reduced until the issue is fixed, the engine doesn't just "fail" 😂😂

      • dtc on 04/03/2022 - 21:59

        Yea, stuck 75km from home in limp mode. LOL, heaps of fun.

        Plenty of stories about DPF issues

        https://forums.whirlpool.net.au/archive/2771784

        And if you don’t manage to do a burn in time, the DPF fails, the car won’t start and you are up for $1000s to replace it. Many euro cars have had sensor failures meaning people couldn’t tell they needed a burn off (mondeo is pretty good on this but I don’t think you can initiate a manual burn, so if you don’t drive long enough you are at risk)

        Mercedes diesel manual "If the vehicle is mostly driven for short distances, it is possible that malfunctions may occur during the automatic cleaning of the diesel particle filter. This can lead to engine damage

        • brendanm on 05/03/2022 - 09:25

          Cool, you listen to whirlpool, I'll go off actual experience 👍

          The dpf light will come on days before it goes into limp mode, to let you know that ash levels are getting high. It doesn't suddenly go from driving perfectly, to limp mode, in 2 seconds.

  • JimB on 04/03/2022 - 11:23

    "As turbocharging evolved, the modern turbo petrol engine started to deliver exactly the same driving benefits of a diesel engine, while still achieving real-world fuel efficiency".

    Not from my experience.

    For a performance or light/medium car, I'd go turbo petrol over diesel, but I found diesels are much more economical when it comes to heavy cars such as SUVs and 4WD.

    FWIW I've a 3.0L T6 petrol and a 2.0L TT Diesel. Both cars about the same weight.

    T6 drinks petrol like it's going out of fashion. T6 petrol is more powerful but torque is about the same. For day to day driving, they're similar but obviously the the T6 revs higher/harder when needed. Diesel uses 40% less fuel overall.

    • Euphemistic on 04/03/2022 - 20:03

      What vehicle is the T6 petrol? There aren’t many turbo petrol engines in other cars that aren’t focussed on performance, which equates with more power -> more fuel burnt. Diesel is more focussed on less fuel use.

      My folks have an ecoboost Falcon. While it doesn’t have a diesel equivalent, it’s almost as good as the Barra motor for day to day driving performance and much less thirsty.

      • JimB on 04/03/2022 - 21:43

        Volvo 3L turbo straight 6.

        BMW is prob the most famous 3L turbo straight 6.

        Lovely engine but thirsty.

        • Euphemistic on 05/03/2022 - 06:36

          Performance engines are thirsty.

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