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Mad Scientist
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#306141 30-Jun-2023 17:44
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can someone tell me if there are different grades of diesel in NZ?


I find it difficult to understand how a 2023 super efficient VW engine uses the same diesel as a 1980 toyota 4WD diesel spewing black smoke


from my reading there is summer and winter diesel and that's about it!

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  #3097869 30-Jun-2023 17:55
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only one grade afaik.


the old rule of thumb is what improvements in economy the emissions takes away. also there is a big increase in power and the more power you have the more you tend to use it which increases fuel consumption.


but it all depends on what you are actually comparing. if the vw has issues, or driven poorly. big issue with modern diesels is dpf's clogging up because they are not being driven hard enough to passively burn off the soot build up. so they burn extra fuel to burn it out.




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  #3098021 30-Jun-2023 19:26
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what are you reading? some overseas forum/website


have you ever seen a different type of diesel at a service station?


Do we even work to summer/winter conditions like other countries do? our climate is a lot more mild than the ones you are probably talking about.


There are marine diesel products, F76 for example which are used for large maritime vessels, which differs slightly to what you put in your car.

  #3098024 30-Jun-2023 19:34
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looking into it a little more it seems it depends on where you live as you what you get.


"All Shell winter grade diesel, supplied by Z Energy, meets or exceeds the legal specifications.
Winter grade diesel supplied to the Northland and Auckland regions is suitable for use in
temperatures down to minus 6°C. For colder regions such as Otago or Southland, Z Energy
supplies a special winter grade diesel suitable for use in temperatures down to minus 15°C. For the
rest of New Zealand Shell winter grade diesel is suitable for use at temperatures down to minus

  #3098052 30-Jun-2023 22:15
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Diesel has changed over the decades, I believe with increasingly low levels of sulphur allowed. Modern engines and emissions systems need the low sulphur content to operate properly, and it provides I think mild emissions advantages to older engines.


The difference in emissions between a new and old engine is primarily down to engine design, not the fuel. 

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