95 or 98 RON fuel ?

  • Thread starter Thread starter Lorenzo Sandini
  • Start date Start date
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Lorenzo Sandini

Pardon my complete ignorance but reading the manual of my V70 ym2005 it
appears that 98 octane fuel can be used in the 2.5T engine without any
special modification. On my old Opel, there was a little switch
somewhere in the engine that needed to be in the correct position for
the selected fuel.

What is the advantage of higher octane ? I am using standard lead-free
95-octane and my local Shell shop encourages me to switch to their Shell
V-power. Snake oil ?

Lorenzo
 
Pardon my complete ignorance but reading the manual of my V70 ym2005 it
appears that 98 octane fuel can be used in the 2.5T engine without any
special modification. On my old Opel, there was a little switch
somewhere in the engine that needed to be in the correct position for
the selected fuel.
Click to expand...

Does the manual say that either 95 or 98 fuel can be used for the long
term? Or does it say that 95 fuel can be used in an emergency.
 
In the November, 1992 issue there was an article titled On Tue, 02 Oct
Pardon my complete ignorance but reading the manual of my V70 ym2005 it
appears that 98 octane fuel can be used in the 2.5T engine without any
special modification. On my old Opel, there was a little switch
somewhere in the engine that needed to be in the correct position for
the selected fuel.

What is the advantage of higher octane ? I am using standard lead-free
95-octane and my local Shell shop encourages me to switch to their Shell
V-power. Snake oil ?
Click to expand...

Lorenzo, the advantage of higher octane in modern computer-controlled
engines is that one thing goes faster -- the flow of money from your
wallet.
 
Lorenzo, the advantage of higher octane in modern computer-controlled
engines is that one thing goes faster -- the flow of money from your
wallet.
Click to expand...

We talked about this here not so very long ago. When the price of an
average fill-up (say, 50 litres) costs 63.50 euros with 95 and 65.00
euros with 98, it's kind of silly to to worry about saving a few cents.

cheers,

Henry
 
Lorenzo Sandini said:
Pardon my complete ignorance but reading the manual of my V70 ym2005 it
appears that 98 octane fuel can be used in the 2.5T engine without any
special modification. On my old Opel, there was a little switch somewhere
in the engine that needed to be in the correct position for the selected
fuel.

What is the advantage of higher octane ? I am using standard lead-free
95-octane and my local Shell shop encourages me to switch to their Shell
V-power. Snake oil ?

Lorenzo
Click to expand...


The ECU should allow a bit more boost and more advanced timing with higher
octane fuel if it's designed to take advantage of that, so you'll get more
power. Whether it's enough to be noticeable I'm not sure. The engine has a
knock sensor so low octane fuel will retard the ignition timing and reduce
the boost pressure.
 
Hi Lorenzo,

Lorenzo said:
Thank you everyone for your answers, it's 95E for me, until I win
at the lottery :)
Click to expand...

For the same reson we use simple 91 octane for our Volvos in the
family - '95 850, '96 460 and '99 V40. Even in my 160 hp turbo I don't
feel any difference to higher grades. But yes, I know, in Finland the
lowest grade is the 95 octane (being there in summer... ;-) ).


Roland
(Austria)
 
When you turn up the wick on the turbo you will find the higher octane will
stop the motor from pinging giving power with out ruining the motor./
 
"James Sweet" <[email protected]> skrev i en meddelelse

KLIP
The ECU should allow a bit more boost and more advanced timing with higher
octane fuel if it's designed to take advantage of that, so you'll get more
power. Whether it's enough to be noticeable I'm not sure. The engine has a
knock sensor so low octane fuel will retard the ignition timing and reduce
the boost pressure.
Click to expand...

You are absolutely right.

I can feel the difference between 95 RON and 100 RON on my Volvo driving on
german roads (Autobahn with no speed limit).

There is much more power and top speed in the engine.

Regards
Bjørn J. (Volvo S80 T6 in BSR trim with app. 330 Hk).
 
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