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Thread: Do diesel engine really wear out faster than petrol engines?

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    Question Do diesel engines really wear out faster than petrol engines?

    Hey guys!

    I heard from an "experienced" mechanic that diesel engines wear out faster than petrol ones. Then I asked him about that do BMW and Mercedes Benz diesel engines behave the same way considering that they are a lot more refined than conventional Toyota and Honda engines. He said that they wear out faster than Toyota and Honda ones. I think that he is just making this up and I thought that I should ask from real experts. One more thing, he said that cars with manual transmissions have better fuel economy than cars with automatic transmissions. Is it true? And what about a diesel 2004 BMW 730d or 530di, do they have a good diesel engine record?
    I would really appreciate your valuable response!

    Thank you in advance!

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    inexperianced mechanic is what i would say, its actually opposite petrol engines wear out faster, diesel engines have very strong engine blocks too they can take more milage and abuse, bmw and merc diesels are 3 times over engineered compared to toyota honda, and have even long life easily clocking over 300,000 MILES without overhauling or anything, however these diesel engines in pakistan have very little life and the only reason is the wrong servicing techniques of these mechanics, the traditional approach of mechanics doesnt work with these engines, there are numerour thread on this forum you can check out to get a idea,

    manual transmission traditionally used to have better fuel economy however the modern automatics like 7 sod 8 spd or cvt transmissions get much better fuel economy than a manual, the technology has progressed.
    If everything is coming your way, you're in the wrong lane!

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    What about Lexus diesel engines? The 2006 Lexus IS 220D, for example.

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    Still waiting for some more suggestions. So please help! @arzaam.bhatti Thank you for your response. So if one buys a diesel BMW or Mercedes Benz, where should one go for its maintenance? As in German diesel car maintenance?

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    Quote Originally Posted by arzaam.bhatti View Post
    inexperianced mechanic is what i would say, its actually opposite petrol engines wear out faster, diesel engines have very strong engine blocks too they can take more milage and abuse, bmw and merc diesels are 3 times over engineered compared to toyota honda, and have even long life easily clocking over 300,000 MILES without overhauling or anything, however these diesel engines in pakistan have very little life and the only reason is the wrong servicing techniques of these mechanics, the traditional approach of mechanics doesnt work with these engines, there are numerour thread on this forum you can check out to get a idea,

    manual transmission traditionally used to have better fuel economy however the modern automatics like 7 sod 8 spd or cvt transmissions get much better fuel economy than a manual, the technology has progressed.
    no imho cars with manual transmssion are always more fuel economical than their a/t counterparts be it cvt or conventional ones

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    Quote Originally Posted by akramsalman.164 View Post
    What about Lexus diesel engines? The 2006 Lexus IS 220D, for example.
    same applies if its serviced right (EGR) etc, then it will have along life, additionally the high sulphur content in pakistani diesel and the fact that most owners use the wrong type of oil in their cars results in diesels in pakistan having a shorter life, its not a general rule, merely a exception to that rule.
    If everything is coming your way, you're in the wrong lane!

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    Quote Originally Posted by sunhonbun View Post
    no imho cars with manual transmssion are always more fuel economical than their a/t counterparts be it cvt or conventional ones
    pick up any modern bmw or lexus or mercedes and see their fuel consuptiom figures for manual and for auto, you will yourself come to know modern automatics have much better fuel economy


    it doesnt apply to the crap prosmatic or 4spd auto gearboxes we get here,
    If everything is coming your way, you're in the wrong lane!

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    So @arzaam.bhatti, according to you even Pakistani air is bad for good cars?

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    Quote Originally Posted by arzaam.bhatti View Post
    pick up any modern bmw or lexus or mercedes and see their fuel consuptiom figures for manual and for auto, you will yourself come to know modern automatics have much better fuel economy


    it doesnt apply to the crap prosmatic or 4spd auto gearboxes we get here,
    Bhai, "crap" is an understatement for what we get here.

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    From my side, give that mechanic a hard punch on face.
    He doesn't have right to call himself a mechanic if he doesn't know the basis about the diesel engines and petrol engines.
    Diesel engines are more economical, heavily built and more reliable than petrol. In the cases of German Cars like BMW, you can guess it by your own that they are quality built under TQM (Total Quality Management) by looking at the prices.
    Well about second part he is right that manual are better in averages as compared to automatics. But you have to let go the fuel economy if you want comfort. My experience in few years is like
    Manual = Fuel economy, less comfort
    Automatic = Comfort, less Fuel economy

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    Diesel engines always last longer, unless worked on by ustad Ra
    haters gonna hate, potatoes gonna potate

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    Dont know about diesel engines but modern auto vehicles even if they are not cvt give mileages equivalent to or better than manuals.
    Take the example of current civic. Fuel Economy of 2013 Honda Civic
    OR Accord Fuel Economy of 2014 Honda Accord

    even in the 4 speed automatic corolla there is negligible difference
    Fuel Economy of 2014 Toyota Corolla

    That being the said the biggest factor is the driving conditions and driving style.

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    Quote Originally Posted by margallar View Post
    Diesel engines always last longer, unless worked on by ustad Ra
    "worked on by a ustad" Hahaha!

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    Quote Originally Posted by ToxicDevil View Post
    Dont know about diesel engines but modern auto vehicles even if they are not cvt give mileages equivalent to or better than manuals.
    Take the example of current civic. Fuel Economy of 2013 Honda Civic
    OR Accord Fuel Economy of 2014 Honda Accord
    even in the 4 speed automatic corolla there is negligible difference
    Fuel Economy of 2014 Toyota Corolla

    That being the said the biggest factor is the driving conditions and driving style.
    I agree with you Bhai. This means that automatic and manual transmissions have a difference of approximately 2 kms (less/more). It is a minute difference.

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    Its only pakistan where petrol lasts more then diesels lolz


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    Quote Originally Posted by umarkhan1 View Post
    Its only pakistan where petrol lasts more then diesels lolz


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    Looks like it (considering the conditions of our country).

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    We have 8 cylenders caterpillar engines in our pump units and i never seen any of them down in last six years.still they run like butter.not used on road, but run under full load daily, tested for hydraulic horse power each year. Every 400 hhrs service done. Imagine 6 years.....


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    Quote Originally Posted by akramsalman.164 View Post
    So @arzaam.bhatti, according to you even Pakistani air is bad for good cars?
    When did I say air is bad
    Even the Pakistani climate is not different than others like Middle East is more hotter and dustier and and other Europe more colder so Pakistani has no special climate

    Only I said Pakistani diesel fuel is bad and that's a fact
    If everything is coming your way, you're in the wrong lane!

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    Quote Originally Posted by akramsalman.164 View Post
    Still waiting for some more suggestions. So please help! @arzaam.bhatti Thank you for your response. So if one buys a diesel BMW or Mercedes Benz, where should one go for its maintenance? As in German diesel car maintenance?
    I would say stay clear if an old mercedes or BMW diesel or be prepared to spend some bug jones fixing it right
    For maintenance there is BMW Dewan and Shahnawaz but it's quite expensive and sometimes they come up with absurd repairs or procedures
    Second is INH but even there you have to ow what you are doing and can't simply reply in hone. To donut right first time
    So best read thrusts forum and make sure all maintained is done in accordance with factory specification
    If everything is coming your way, you're in the wrong lane!

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    i've been using toyota diesel engines for like 10 years now, diesel engines are good engine they start to give smoke at 40k kms and most of the engines i used started to reduce the oil at 140k kms so it means that they actually start to wear at above 100k kms but mainly it depends on the way you drive and diesel quality and lubricants one use

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