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
Lorenzo
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.
Lorenzo, the advantage of higher octane in modern computer-controlled engines is that one thing goes faster -- the flow of money from your wallet.
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
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.
This may be of interest (hope the link works for you all):
Thank you everyone for your answers, it's 95E for me, until I win at the lottery :)
Lorenzo
Hi Lorenzo,
Lorenzo Sandini schrieb:
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)
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