F30 August 2013 - RON95 or RON97?
- Thread starter MeganWYR
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Not sure about pumping 97 will clean the engine though. However my SA did say that they filled up my car with RON95 during the delivery day. No need 97 he said. Like splee said, modern engine will able to adapt to whatever fuel you fill up as long as within the spec. However friend of mine advice me to not mix between 95 & 97 coz it can cause engine knocking due to different octane number which has different behaviour. Never bother to do research since it sound logical... :sleep:
That's not how these cars work. Filling up different grade fuels once in a while will only make it worst.
Your engine controls are adaptive and the computer takes time to adjust to different fuel grades, changing fuel grades causes the computer to readapt , this takes time, meanwhile you are running inefficient.
Stick with the fuel grade and fuel brand - there are slight differences.
"Sometimes, during these adaptations, the car goes in to "twillight" mode, where it's adaptations goes beyond normal.. then issues like jerking, transmission bumps, rough idling comes in." - bad cases throws codes - time to find ISTA\D to reset adaptations- bear in mind VANOS adaptations will also come to a point where you will hear ticking sounds in the N20."
And, if you are going to get some under the tree mechanic with "inadequate" computer to do this reset, prepare for a bumpy ride. these Chinese "boxes"- not only reset engine adaptations, but also throws your drive train, and suspension into "test mode". Even SC have an issue reversing these effects - unless they reprogram the drivetrain and ride heights (on the F10s).
The above is my own opinion and observations after spending a lot of time researching the adaptations settings and effects on the N20.
Your engine controls are adaptive and the computer takes time to adjust to different fuel grades, changing fuel grades causes the computer to readapt , this takes time, meanwhile you are running inefficient.
Stick with the fuel grade and fuel brand - there are slight differences.
"Sometimes, during these adaptations, the car goes in to "twillight" mode, where it's adaptations goes beyond normal.. then issues like jerking, transmission bumps, rough idling comes in." - bad cases throws codes - time to find ISTA\D to reset adaptations- bear in mind VANOS adaptations will also come to a point where you will hear ticking sounds in the N20."
And, if you are going to get some under the tree mechanic with "inadequate" computer to do this reset, prepare for a bumpy ride. these Chinese "boxes"- not only reset engine adaptations, but also throws your drive train, and suspension into "test mode". Even SC have an issue reversing these effects - unless they reprogram the drivetrain and ride heights (on the F10s).
The above is my own opinion and observations after spending a lot of time researching the adaptations settings and effects on the N20.
My apology on not elaborating further on this matter.Tristars said:
This not what the head of service said to me about this matter. There is a case whereby a car stalled due to carbon build up inside the engine and it was found that the owner pumped RON95 all the while and the case got blown out of control with various parties involved as the owner insisted that a BMW should run fine on RON95 as stated in the car fuel cap but reality is our fuel quality isn't as good as what we think it is..(I personally had 2 family cars stalled on the highway due to poor fuel quality as the fuel filter was clogged up after using the lowest fuel octane for a good amount of years)
Hence the reason why I am advised by the dealer to pump RON97 for a few rounds upon reaching an empty tank to flush out any RON95 residue and to and make sure the engine control unit adapts to the new fuel quality and this is what I noticed while doing this (running RON95 for 2-3 months and using RON97 to do the cleaning).
The total mileage on the computer will increase to approx. 20km extra the MOMENT I pump a higher octane...be it RON97 or the Shell V-Power Racing which is said to be even cleaner and better. But when I switch back to RON95, the system will show a lower average total mileage I will get with the lower fuel quality. How it knows I switched fuel quality is really astonishing though.
Of course when I switch back to RON95 after pumping RON97 2-3 times, the first fill up will suffer in FC as the computer needs to adapt back to the fuel quality but it will improve in the 2nd and future fill ups of RON95. For clarity sake, I've been doing this over the past few months and taking note of the difference the above is what I've observed.
Ideally I would have gone RON97 all the time but since my tax money is being used to subsidize RON95....heck must well I make full use of it until the day our fuel is no longer subsidized.
splee
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Thanks for sharing with us your experience on using Ron 95 and Ron 97 alternately. I am surprise that the OBD shows a different mileage between 95 and 97. I used to think the same way as you. Since I am paying tax, I should utilise the fuel subsidy given for 95. However, after some deep thinking, I decided to pump 97 all the way. Why? Because there's nothing you can do about the tax that you have paid. It's a sunk cost. Why compromise on your joy and satisfaction just because you felt lose out for paying so much tax. I feel that the enjoyment and satisfaction that I get from a more responsive engine and better power far outweighs the additional cost that I have to pay. I have calculated. Based on my mileage of about 30k km per annum, I have to pay an additional of about $2300 per year. This works out to be less than $200 per month. Can I afford this? Yes I can. And from then on I never look back. Just enjoy the drive like it should be from a BMW.seancorr said:
Hehe yeah the higher octane does make a difference in the engine and that change in the OBD does still surprise me when I filled it up with RON97 yesterday. To be honest I did think of going 97 all the way since the annual mileage is only 13k but home minister made noise saying that with every tank she can get a month's supply of pampers for our kid....no arguing on that!splee said:
ganeshkumar328
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Hidup BN!!!
sorry to comment on this.. the SC or SA that says this should be SHOT! cleaner??!! 5 years in chemical and petroleum engineering also never teach me this... chemically speaking... a little different. physically... carbon residue has nothing to do with Octane. the amount of carbon molecule per mL. is still same. caloric value still same.... unless got built in indon maid inside the fuel to mop!MeganWYR said:
