RON 95 or RON 98

lightpainter · 19th December 2006, 07:06

Just been re-reading my rover 75 V6 Auto Conn SE owners hand book, under fuel system it quotes Type of fuel “95 RON” unleaded petrol to EN 228 specification.
A little further down the page it states “for optimum engine performance, 98 RON unleaded petrol should be used”.
Have any member ever tried a comparison test with these two grades i.e. performance, MPG, Etc, is it worth the extra expense

It's only a lump of metal that gets you from A to B but boy what a lump

Spôôk · 19th December 2006, 07:17

Quote:

Originally Posted by lightpainter

Just been re-reading my rover 75 V6 Auto Conn SE owners hand book, under fuel system it quotes Type of fuel “95 RON” unleaded petrol to EN 228 specification.

Ehrmmm, if you had a diesel you could use Rover-RON

driverjgp · 19th December 2006, 07:29

Quote:

Originally Posted by lightpainter

Just been re-reading my rover 75 V6 Auto Conn SE owners hand book, under fuel system it quotes Type of fuel “95 RON” unleaded petrol to EN 228 specification.
A little further down the page it states “for optimum engine performance, 98 RON unleaded petrol should be used”.
Have any member ever tried a comparison test with these two grades i.e. performance, MPG, Etc, is it worth the extra expense

It's only a lump of metal that gets you from A to B but boy what a lump

I've tried all sorts of super fuels and I know members on the forum have mixed feelings on this but personally I don't really feel any difference between the two fuels and most super fuels are now over 98RON anyway, I do use is good brands of fuel, I do notice quite a difference using Tesco fuel to using Shell regular fuel, Shell gives me more performance and better MPG and has a better additive pack in the fuel, I always use Shell where I can but don't get me wrong if my gauge was hovering on empty and I was passing Tesco I will fuel my V6 from there and I sure there nothing wrong with the fuel its down to personal preference.

hth

Fille · 19th December 2006, 08:08

I use 98 nowadays, the engine gets better torque and uses (slightly) less fuel. You don't notice after only one tank though, but fill it uo a couple of times...

Panrock · 19th December 2006, 11:09

AFAIK the ECU knock sensor ignition timing adjustment for the 2.5 doesn't advance it any further than for 95RON.

All I've noticed with using 98RON is that the engine seems slightly noisier on idle. Could be my imagination of course though.

Steve

Roverron · 19th December 2006, 12:59

Quote:

Originally Posted by Spôôk

Ehrmmm, if you had a diesel you could use Rover-RON

Unfortunately I won't fit down the filler pipe!

Ron

driverjgp · 19th December 2006, 13:04

Quote:

Originally Posted by Panrock

AFAIK the ECU knock sensor ignition timing adjustment for the 2.5 doesn't advance it any further than for 95RON.

All I've noticed with using 98RON is that the engine seems slightly noisier on idle. Could be my imagination of course though.

Steve

It will advance up to 98 RON.

Look at the technical data in your handbook, in my book it is on page 192-193

Jason

MartinW · 19th December 2006, 16:58

Knock sensors don't advance the ignition, they only retard it in the event knock is detected.

My preference is Shell Vee-power and Tesco 99. You are more likely to notice the loss in the performance rather than the gain. Also, if you don't go much above 4000rpm before changing gear normally then go with a quality 95, in my experience. I like the super because I have a heavy right foot with a tendency to enjoy the howl all the way through to the redline - and I accept that I probably pay for the enjoyment in the higher fuel cost.

driverjgp · 19th December 2006, 18:11

Quote:

Originally Posted by MartinW

Knock sensors don't advance the ignition, they only retard it in the event knock is detected.

My preference is Shell Vee-power and Tesco 99. You are more likely to notice the loss in the performance rather than the gain. Also, if you don't go much above 4000rpm before changing gear normally then go with a quality 95, in my experience. I like the super because I have a heavy right foot with a tendency to enjoy the howl all the way through to the redline - and I accept that I probably pay for the enjoyment in the higher fuel cost.

Don't forget the extra addictive pack you get with the super fuels.

19th December 2006, 07:06	#1
lightpainter Posted a thing or two 2004 Rover 75 Saloon 2.5 V6 Conn SE Auto Join Date: Nov 2006 Location: Rainham, Kent. Garden of England Posts: 1,162 Thanks: 28 Thanked 42 Times in 6 Posts	RON 95 or RON 98 Just been re-reading my rover 75 V6 Auto Conn SE owners hand book, under fuel system it quotes Type of fuel “95 RON” unleaded petrol to EN 228 specification. A little further down the page it states “for optimum engine performance, 98 RON unleaded petrol should be used”. Have any member ever tried a comparison test with these two grades i.e. performance, MPG, Etc, is it worth the extra expense It's only a lump of metal that gets you from A to B but boy what a lump

19th December 2006, 08:08	#4
Fille Loves to post SOLD - Rover 75 Tourer 2,0 V6 Connoisseur Auto Join Date: Nov 2006 Location: Vaasa Posts: 476 Thanks: 0 Thanked 1 Time in 1 Post	I use 98 nowadays, the engine gets better torque and uses (slightly) less fuel. You don't notice after only one tank though, but fill it uo a couple of times...

19th December 2006, 11:09	#5
Panrock Regular Rover 75 V6 Tourer & Rover P4 100 Join Date: Dec 2006 Location: Worcestershire Posts: 72 Thanks: 1 Thanked 5 Times in 4 Posts	AFAIK the ECU knock sensor ignition timing adjustment for the 2.5 doesn't advance it any further than for 95RON. All I've noticed with using 98RON is that the engine seems slightly noisier on idle. Could be my imagination of course though. Steve

19th December 2006, 16:58	#8
MartinW Newbie MG TF LE500 Join Date: Nov 2006 Location: Chester Posts: 2 Thanks: 0 Thanked 2 Times in 2 Posts	Knock sensors don't advance the ignition, they only retard it in the event knock is detected. My preference is Shell Vee-power and Tesco 99. You are more likely to notice the loss in the performance rather than the gain. Also, if you don't go much above 4000rpm before changing gear normally then go with a quality 95, in my experience. I like the super because I have a heavy right foot with a tendency to enjoy the howl all the way through to the redline - and I accept that I probably pay for the enjoyment in the higher fuel cost.