Posted: Sat Dec 10, 2016 3:29 pm Post subject: 1979 Porsche 911 SC - which fuel to use? 95 Ron or 97/99 ron
Just wanted to find out what fuel other people are using?
Git my 79 911 SC in October and I know this was originally designed for leaded fuel. Reading articles about classic cars says that Porsche didn't use hardened valve seats until 1985 on euro cars but did on US cars due to catalytic converters. Brian Aderson states that it's ok to use unleaded fuels on early cars but again this is an American author.
Another article I read about Porsche 911's up to 1985 states that the valve seats and guides should be replaced to accommodate unleaded fuel, although should be fine for up to 20,000 miles after using leaded.
Just wondering what fuel everyone else is using?
Any additives to compensate?
Riviera Bob Nürburgring
Joined: 07 Nov 2013 Posts: 460 Location: France
Posted: Sat Dec 10, 2016 3:46 pm Post subject:
You'll be fine with Superunleaded....preferably Shell. Only additive I've considered is one to compensate for the increasing use of ethanol but am told that it's still max 5 per cent in Super at present so haven't bothered....yet!
Palladium Watkins Glen
Joined: 01 Nov 2015 Posts: 2102
Posted: Sat Dec 10, 2016 3:57 pm Post subject:
I just use regular, runs great, occasionally bang a super in for the hell of it
grbspeedster Nürburgring
Joined: 11 Nov 2007 Posts: 450 Location: Rugby
Posted: Sat Dec 10, 2016 6:21 pm Post subject:
No cars were designed to run on unleaded have a copy of the data sheet from Porsche with details on if you want it. Pm your email and will send copy
Ran my SC for 10 years and Speedster for 10 1/2 years with no issues
Did put super in if doing long distance high speeds I.e when travelling down through France etc _________________ Geoff
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