Date: Fri, 10 Mar 2000 12:43:40 -0000
From: "Simon" <swellernopsamral.co.uk>
Subject: Re: unleaded fuel - saab 1984


> Unfortunately no experience with that year model, but I do know that the > ability of the engine to tolerate unleaded is dependent on new hardened valves > and seats introduced at around 1984. I'm talking European market now. I think > that the US market has had hardened valves a very long time now, due to > requirements for unleaded petrol and catalytic converters back in the 1970's. > I have an early '85 900i (UK - C reg), which uses unleaded quite happily. The owners manual which is dated 1985 and recommends, I quote, "It is recommended that 98 octane fuel, but a minimum of 91 may be used. Normally aspirated, carburettor and Fuel Injection engines 97 octane". on lead free it states "Turbo engine cars may be run on lead free having a minimum octane rating of 91 (RON) and normally aspirated engines on lead-free fuel having a minimum octane rating of 93 RON". Which just about makes everything clear (!!). I think UK unleaded is 95 RON and Super Unleaded is 98, (I know this doesn't help Jan, as he's not in Britain but the same price hike on 4 star and UL exists here too) -- Simon Brighton England

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