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Could it also be that the premium fuel cleaned the injectors etc. and this is benefiting the follow-on refills with non-premium fuel? :shrug: |
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:smilie_re:https://www.esso.co.uk/fuels-faqs |
Hi Alan. There was next to nothing in the egr. Took about five minutes to wipe it out.I always use Redex so there could not have been any fouling of the injectors. I honestly think it is the lower 5w40 oil.
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If the EGR was sticking, and you used fluid to clean or even nudging the actuator to wipe may have loosened it up to work. Removing the vacuum pipe and refitting even could have got it going again. I have to say though, at present and for the past 12 or 13 years we dont have emissions tests on the diesels, after they were abandoned due to concerns of engine failures. :shrug::shrug::shrug::duh::duh::duh::duh::eek::eek ::eek: The 5w40 part of the oil wont be the benefit, but the ACEA rating as this relates to ash(?) content or something - even the oil change itself could possibly be the issue? :shrug: The Redex, may well maintain the fuel system, again I whilst I do not know, I think with modern fuels and tolerances etc it is less benefit than it would have been 30/40 years ago. It showed absolutely no benefit to me when I compared injector readings on an overnight soak with redex compared to an overnight soak the following week with Forte (they are very different products though!). I do believe Redex to be unnecessary in this day and age. Like a dying atheist, converting to christianity, I still buy it when on offer and add it when I remember ;). But the injectors will still wear down over time (affecting spray pattern, volume etc). There are simply too many variables for me to suggest that it was the fuel. |
Did you know that you can get more or less feeling of power depending on the material your trousers are made from ???
Most of the guys on this thread use the seat of their pants as a finely tuned instrument to make their judgements. So guys, try silk pants on leather seats to give yourselves the thrill of your lives.----:D Go on; you know it makes sense.--;) At least as much sense as this thread.--:p: |
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Now for the chemistry lesson: Oil is a hydrocarbon fuel, meaning the individual molecules contain carbon and hydrogen atoms chained together. Modern petrol is blended according to various recipes, the active ingredients for which include about 200 different hydrocarbons, each with a spine of between 4 and 12 carbon atoms. One of them, isooctane, consists of 8 carbon and 18 hydrogen atoms (C8H18) and is exceptionally resistant to exploding spontaneously when exposed to the heat and pressure found inside a typical combustion chamber. Another, n-heptane (C7H16) is highly susceptible to such self-ignition. These two compounds are therefore used to rate the knock resistance of all petrol blends. Petrol that resists knock the way a mixture of 87-percent isooctane and 13-percent n-heptane would is rated at 87. Racing fuels with octane ratings over 100 resist self-ignition even better than pure isooctane. The octane ratings for regular-grade fuel range from 85 to 87, mid grades are rated 88 to 90, and 91 and higher is premium. |
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None of what you or Marinabrian says means that a car that is tuned (i.e. optimised) to run with a certain RON or Cetane fuel will not benefit from a higher rated fuel. The reason is that there are always multiple variables under consideration when optimising any thermal or physical process. You need to do some real-world tests instead of trying to baffle members with atomic structures of hydrocarbons. It appears that some members may speak with their trousers full :D;) |
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