95 RON not 97

A

andysat

Lifer
Hi all,i mistakedly put in a post that i use 97RON but just realised yesterday i have been putting in 95 :oops: -would this be a possible cause for the emission light coming on?-thanks
 
hi

hmm, I always use 95 :> I think it also state in manual, that the engine use 95 or 98 fuel (or 97 - depends on a country). Or I haven't understood Your post correcttlly ;)
 
I've used both.
95 cheaper and car runs sweet.
97 more expensive but bigger bang AND better economy so it offsets the price.
The difference is 11p litre at my local so less than 10%. After 2-3 fill-ups I'm getting 10% more out of a tank and having more fun with the loud pedal.
By the way my light is still out......
Have you sorted that yet andysat?
 
andysat said:
Hi all,i mistakedly put in a post that i use 97RON but just realised yesterday i have been putting in 95 :oops: -would this be a possible cause for the emission light coming on?-thanks
Click to expand...

I shouldn't think it makes a difference. However, lately I have treated my car to Shell V-Power on a couple of ocassions. Not sure if it makes a diference to either performance or better mpg but they say on the blurb that it contains more additives. Usually just use Shell unleaded, avoiding supermarket petrol, since there's an 8p per litre price difference at present between the two Shell brands of petrol.
 
I always use 95 Ron, but only from shell or esso. No problems, but mine is a baby 2.2 :-(
 
GregZ4 said:
I've used both.
95 cheaper and car runs sweet.
97 more expensive but bigger bang AND better economy so it offsets the price.
The difference is 11p litre at my local so less than 10%. After 2-3 fill-ups I'm getting 10% more out of a tank and having more fun with the loud pedal.
By the way my light is still out......
Have you sorted that yet andysat?
Click to expand...
-Still waiting to hear from the stealers re manifold replacement :( -thats what they are saying it is-even though it flew through an emissions test
 
when i first bought the car, i used 95 ron and it ran a bit smokey.

put tesco momentum in for a few months now and it runs a dream, no smoke when warm.

that's 99 ron aswell. makes some nice burble noises and the occasional pop also.
 
When I filled up my car for the first time (bought it with 22,000 miles) I out in 95 and my emission light came on. I contacted the previous owner who said he'd always used 98. After a hundred miles or so the light went out. Maybe it takes a little while for the sensors to adapt to different fuel.
I still use 95.
 
andysat said:
-Still waiting to hear from the stealers re manifold replacement :( -thats what they are saying it is-even though it flew through an emissions test
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Ouch!!!! You sure that's what it is? Surely you'd get some noise if the manifold is gone..............
 
GregZ4 said:
andysat said:
-Still waiting to hear from the stealers re manifold replacement :( -thats what they are saying it is-even though it flew through an emissions test
Click to expand...

Ouch!!!! You sure that's what it is? Surely you'd get some noise if the manifold is gone..............
Click to expand...
They are saying it is the cat/cats on the manifold-it was replaced March or May 2011,so should be guaranteed -unless they move the goalposts,and say its something else
 
Don't think that could be connected to Cat error. The engines are designed to run on different grades. My old 3 series had the same engine designation and I ran it on 95, 97 and 99 depending on how healthy my wallet was when I filled up :)


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I tend to mostly use 95 to be honest the 8p a litre extra for Optimax in my opinion just isnt worth it. I usually put in some 99 once a month just to give it a blast but mine runs ok on 95.
 
Our cars should always run fine on 95, 97 or 99 RON fuel... RON is the fuels resistance to detonation (knock) and as we neither run very high compression ratio's or are turbo/super charged it's irrelevant as we are no where near the detonation threshold.
Power increase claims whist they may be valid are so tiny you would never notice, there have been many back to back dyno tests of different fuels to show this (One of the recent episodes of Fifth Gear foe example).
As for increased economy that's rubbish IMO, the car always injects the same quantity of fuel under any given load based on the fuel tables in the ECU... It doesn't know there is a 'better' fuel in the tank and use less accordingly! lol
In theory you may be a little lighter on the throttle if you feel the car is more responsive and save a bit but in the real world probably not.
 
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