V50 Engine Turbo : - Super Unleaded ?

njruddell · May 3rd, 2007, 00:47

I seem to recall it says somewhere in the instruction manual that the T5 is supposed to run on 98 RON unleaded (ie Super unleaded). For a long time I have used standard 95RON but after a few tanks of Sainsburys super (97 RON) I noticed the MPG picking up a bit. I'm now trying the full blown Shell Super unleaded (98 RON) and it seems better still. Haven't had a chance to really try performance yet but will be having a blast on closed roads this weekend. Has anybody any views of what is the best juice to use?

PNuT · May 3rd, 2007, 05:24

pages of info on the 850/70 forum

7050man · May 3rd, 2007, 19:20

Can't add anything re V50, but my previous car (V70 2.4 170) did run much better on Shell OPtimax although I didn't use it all the time as too expensive.
Performance was better and also mpg.

Most of time I was using Shell 95 with the odd tank of supermarket stuff once in a while if prices were right.

In my experience, to get benefit of 98RON after using std 95 RON, you really need to run a few tankfuls through.

Over life of car (70k miles)I averaged 36.5 mpg, mostly on 95RON.

Alec Dawe · May 3rd, 2007, 20:01

As I understand the technology, if the cars have a knock sensor for the ECU, then it will advance the ignition timing to the pinking point, then back off a bit, so if you're using 97/98 octane, you'll get more advance to make better use of the fuel's burning characteristics.
Hence more power, or if you're not always using the power, more mgp.

I stand to be corrected on this explanation!!

May 3rd, 2007, 00:47	#1
njruddell XC90 D5 Last Online: Jul 24th, 2022 01:46 Join Date: May 2007 Location: Lisburn	Super Unleaded ? I seem to recall it says somewhere in the instruction manual that the T5 is supposed to run on 98 RON unleaded (ie Super unleaded). For a long time I have used standard 95RON but after a few tanks of Sainsburys super (97 RON) I noticed the MPG picking up a bit. I'm now trying the full blown Shell Super unleaded (98 RON) and it seems better still. Haven't had a chance to really try performance yet but will be having a blast on closed roads this weekend. Has anybody any views of what is the best juice to use?

May 3rd, 2007, 05:24	#2
PNuT MaDMaN Last Online: Nov 26th, 2022 18:47 Join Date: Sep 2006 Location: Red Lodge	pages of info on the 850/70 forum __________________

May 3rd, 2007, 20:01	#4
Alec Dawe Former Support Team Last Online: Jan 26th, 2024 11:26 Join Date: Jan 2006 Location: Nr Norwich	As I understand the technology, if the cars have a knock sensor for the ECU, then it will advance the ignition timing to the pinking point, then back off a bit, so if you're using 97/98 octane, you'll get more advance to make better use of the fuel's burning characteristics. Hence more power, or if you're not always using the power, more mgp. I stand to be corrected on this explanation!! __________________ Alec. (My other car is a WD 2-10-0)

May 3rd, 2007, 19:20	#3
7050man Master Member Last Online: Jan 25th, 2019 17:19 Join Date: Feb 2006 Location: Kent	Can't add anything re V50, but my previous car (V70 2.4 170) did run much better on Shell OPtimax although I didn't use it all the time as too expensive. Performance was better and also mpg. Most of time I was using Shell 95 with the odd tank of supermarket stuff once in a while if prices were right. In my experience, to get benefit of 98RON after using std 95 RON, you really need to run a few tankfuls through. Over life of car (70k miles)I averaged 36.5 mpg, mostly on 95RON.

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