2 stroke oil added to diesel is it a good idea?

Discussion in 'Motorhome Chat' started by DavidG58, Aug 9, 2015.

  1. DavidG58

    DavidG58 Funster

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    Just read on a totally different topic about adding 2 stroke oil to a diesel tank to improve mpg, noise and power, anybody done it?

    @rapido convert, not doubting your word, but wonder if it is only OK with older engines

    As mine is already in dry dock with a turbo / engine management issue, I am very worried it cause knock on problems
     
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  2. John Laidler

    John Laidler Funster

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    Being a cynic if this trick produces the results some claim for it then you would think the fuel companies would add it themselves.

    Lots of anecdotal reports of improved mpg etc but I would like to see the results of a controlled test. It's too easy for someone who believes they get better mpg to find they apparently do but it is impossible to rule out a subconscious change of driving style in these cases. It needs a proper double blind trial where neither the driver or the person putting the fuel in knows what's in it.
     
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  3. DuxDeluxe

    DuxDeluxe Funster Life Member

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    Engine manufacturers spend a large fortune of developing engines to work under varying conditions which includes the EN590 standard fuel available and sold in Europe. It already has the additives required (yes, including that "rubbish" bought at ASDA/Tesco etc) and the addition of extra oil to the diesel is not going to affect anything except perhaps the warranty on a newer vehicle. The is a lot of anecdotal chat about two stroke oil addition, but notwithstanding the above potential warranty issue I would not put any in a modern engine. It may have worked 20 years ago, but not now. Someone will no doubt shoot me down in flames but fuels and fuel quality has been my job for over 30 years
     
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  4. DuxDeluxe

    DuxDeluxe Funster Life Member

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    Exactly DBK (y)(y) Shell spent a fortune on their most recent fuel which claimed to improve economy by "up to" 2 litres per tankful
     
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  5. DavidG58

    DavidG58 Funster

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  6. Irishrover

    Irishrover Read Only Funster

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    Leave well enough alone methinks.....
     
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  7. John Laidler

    John Laidler Funster

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    There's a link in that summary to the sort of proper test I was talking about - it's conclusion was folk are at best wasting there time adding 2 stroke oil to diesel. But it won't stop people doing it and being totally convinced their engines run sweeter. :):)
     
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  8. Techno

    Techno Funster Life Member

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    Yes I'll give it a miss
     
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  9. Derbyshire wanderer

    Derbyshire wanderer Funster Life Member

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    You can use 2 stroke oil, cooking oil, hydraulic oil and most types of thin oils in old type engines with rotary injection pumps (and some in line ones) and run them for a long while without noticing anything untoward.
    Modern engines with high pressure common rail injection use components that will probably fail or block up even using moderate quantities of oils that are not diesel.
    Anyone remember adding kerosene to make winter fuel? I recently had a problem with a container handler not starting due to fuel waxing and the manufacturer were clear that this is not acceptable as a fix.
     
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  10. mjltigger

    mjltigger Funster

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    Bet they added 2 stroke oil [​IMG][​IMG][​IMG]
     
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  11. DuxDeluxe

    DuxDeluxe Funster Life Member

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    (y)(y)(y)
     
  12. richr

    richr Funster

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    As said two stroke works well in older engines

    A mate of mine used to put it in his tank on his old Discovery and said it quietens it down, didnt say anything about better MPG
     
  13. DuxDeluxe

    DuxDeluxe Funster Life Member

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    The handbook for my Jaguar says very specifically - no additives in the fuel. Not even cetane improvers - though super fuels such as VPower are permitted as they exceed EN590 rather than just meet it.

    DIESEL ENGINED VEHICLES

    Do not use RME (bio-diesel) except in the case of those proprietary diesel fuels which contain a mix of up to 5%. Jaguar can accept no responsibility for damage caused by using RME in concentrations greater than 5%.

    Use only high quality diesel fuel according to EN590 or equivalent.

    The quality of diesel fuel is variable, depending on geographic location. Always use premium or the highest quality fuel available in your locality. High quality fuel ensures a longer life for your engine components. Lower grade fuel contains higher levels of sulphur, which is detrimental to engine components. If low quality fuel is used, light coloured smoke may be evident at the exhaust.

    Note: Jaguar vehicles are capable of running with up to a 5% blend of bio-diesel, in accordance with European Standard EN590.

    Prolonged use of additives is not recommended. Do not add paraffin or petrol to diesel fuels.
     
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  14. John Laidler

    John Laidler Funster

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    Diesels will run on almost anything within reason. All the Western military vehicles in Iraq and Afghanistan were running on 100% aviation grade kerosene, but then mpg isn't much of a consideration on a battlefield.

    At the other end of the scale the old Chieftain tank was famous for oil leaks which made the engines run on their own neat engine oil. The engines just ran away stopping only when the fans disintegrated and a few conrods poked their heads out into the sunlight. If you were very brave a beret could be thrown into the air intake to stop it, but you had to remove the air filter first!
     
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  15. Enword

    Enword Funster

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    Got customer's been doing it for years & they swear by it, Tried it in our sprinter could not see any difference in mpg but noticeably quieter, could possibly make more difference to supermarket diesel
     
  16. Derbyshire wanderer

    Derbyshire wanderer Funster Life Member

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    The reason it is quieter is that it has a lower flash point so will preignite, effectively advance the timing with the fuel mix. This could also be done by moving the pump timing.
    The downside is that it is possible to bend the con rods on some engines if the auto advance causes the main combustion pressure to occur before tdc.
     
  17. Bobby22

    Bobby22 Funster

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    I'm with the sceptics....if there was an advantage to be had......the 2 stroke companies would be singing its praises and marketing all these wonderful claims............i'll just stick to the cheap supermarket diesel i've been using for years with no adverse effects.
     
  18. DavidG58

    DavidG58 Funster

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    that really seems to be one hell of a risk to take, my mind is made up :)
     
  19. Enword

    Enword Funster

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    We use supermarket diesel in our old peugeot 206 but wont put it in the Race van or motorhome the difference in mileage is to big
     
  20. DuxDeluxe

    DuxDeluxe Funster Life Member

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    You will often get better consumption by using fuels such a VPower etc but it needs to be balanced against the extra cost. Personally, I put a fill of VPower in every now and again but in this van the effect if cost neutral
     
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