Date: Mon, 10 Oct 2005 22:37:19 +0100 From: "Pidgeonpost" <Pidgeonpostnospambrain.com> Subject: Re: Premium vs. regular unleaded?
"ShazWozza" <shaz_wozzanospamentspring.com> wrote in message news:newscache$umv5oi$mmt$1nospame.onthenet.com.au... > Gary Fritz wrote: > >> I've been wondering this for a while, but I didn't want to enter that >> Australian-argument thread, so here's a Saab-only question: >> >> What would happen if I ran my 2002 9-5 Aero on regular unleaded, instead >> of premium? >> >> My wife thinks it will save us money. I'm concerned it could cause >> damage >> to the engine, or at the very least cause enough power drop that you'd >> lose the cost savings. >> >> Then let's extend the question to her car: she has a 1984 Porsche 911. >> It's supposed to have premium, and it doesn't have the fancy electronics >> that my 9-5 has. What happens if she feeds HER car lower-octane fuel? >> > > Your 9-5 will cope with the lower octane without damage as the trionic > engine management will manage knock. > > My 9000T works happily with 91RON (the owners manual says it requires > 98RON). The only change I can detect is that I can't boost into the red > zone. Still plenty of boost for spirited driving however. I would > probably > use 98RON on a very hot day if the trip entailed climbing steep grades. > > Another family member drives a V6 NG900. This car also runs happily on > 91RON, indeed it gets worse MPG on 98RON. > > Does the 911 have a knock sensor? If not then it is possible to damage the > engine. Perhaps you could have the static engine timing changed and get > the distributor advance curve re-graphed. > > > ....you could of course suggest to your wife that if she really wants to save money she could sell the 911....but let's not go there... :o)
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