Super Unleaded

I have a PDF file on the computer produced in respect of Tesco premium petrol (Monentum) - from memory it's a proper scientific report based on proper measurements and not just random observations and hunches.
I will dig it out and post asap .
 
forget ron rating for a second here event though they have a knock sensor and will adjust.

Tesco 99 momentum has 4 times the additives than normal tesco fuel - these additives help keep your internals cleaner. proof of this has been shown at various car shows with cameras inside of engines that have used either fuel wholly for a number of miles.

then you do certainly get added benefit of a few more mpg so it evens out in terms of cost of the fuels.

my problem is that the only garage near me or on my route is an asda. i'd prefer it was tesco for 99 momentum or a BP for ultimate.

consensus is if you have a half decent car buy premium fuel. if you drive a run of the mill cheap car then don't bother. so i try to use premium whenever i can in the z4. the wife's mini gets asda every time with the odd tank of BP ultimate to give it a bit of a clean, however it is mainly asda in the mini 99% of the time.
 
A few years back I remember watching a test on 5th Gear, can't remember all the cars they tested but it ranged from a Yaris to a Scooby. The nuts and bolts of it was if you run a grandma's shopping trolley then don't waste your money but if you have a performance car, particularly a turbo/supercharged car then it does make a difference.
 
Yes that 5th gear test gave 4 BHP increase on a turbo car. V power in mine. That 4 bhp might come in handy at the traffic lights one day :evil:
 
If you read the 'Honest John' motoring column in the Telegraph he is a big fan of the better quality higher octane fuel. He claims it helps to keep the engine clean and improves mpg. On the whole what he writes is sensible and his advice is usually sound. I don't know whether I am just a sucker but I use it in the Z4 but not in the everyday car.
whether it lives up to it's claims I don't know.
 
BMW 2010 Owner's Handbook (23i, 30i, 35i, 35iS) Munich, pub. BMW

page 189

"It is recommended to use unleaded premium grade petrol with 95 RON."

"Unleaded fuel qualities with 91 RON and higher are permitted."

:driving:
 
Maniac said:
Sticker or not, I reiterate I've done this test on a dyno and premium fuel made more bhp.

My 20i made good power on the Dyno which the operator attributed to super unleaded fuel, if it cleans the internals of your engine and enables it to make more power then why wouldn't you use it?
It even gives you a smidgeon more economy! :)
Rob
 
john-e89 said:
Busterboo post

"Unleaded fuel qualities with 91 RON and higher are permitted."

And as it doesn't give a maximum figure 99 Ron is fine then.

98 is the maximum:

file.php
 
Busterboo said:
john-e89 said:
Busterboo post

"Unleaded fuel qualities with 91 RON and higher are permitted."

And as it doesn't give a maximum figure 99 Ron is fine then.

98 is the maximum:

file.php

Shell V power nitro + rated at 99 ron has up to 5% ethanol mix, the cap suggests and the handbook says you can fill up with fuels with no more than 10% ethanol mix, therefore 99 ron would seem perfectly ok to use, I'd say that was backed up by BMW not, to my knowledge anyway, putting out a statement stating not to use 99 ron nitro for example, especially as they have a connection with Shell. I would suggest the cap sticker is from the E89 first sales in 2009 and hasn't been updated since. Shell nitro + was introduced in 2015.
 
99 RON fuel will do no harm. It may be a waste of money though if the ECU fuelling/ignition map can't take advantage of it. The 10% ethanol is important though - a lot of seals don't like ethanol and can degrade rapidly when exposed to high levels of it.
 
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