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Soundbud
Newbie


Joined: 29 Oct 2016
Posts: 19



PostPosted: Sat Dec 10, 2016 3:29 pm    Post subject: 1979 Porsche 911 SC - which fuel to use? 95 Ron or 97/99 ron Reply with quote

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?
 
  
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Riviera Bob
Nürburgring


Joined: 07 Nov 2013
Posts: 460
Location: France


PostPosted: Sat Dec 10, 2016 3:46 pm    Post subject: Reply with quote

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!
 
  
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Palladium
Watkins Glen


Joined: 01 Nov 2015
Posts: 2102



PostPosted: Sat Dec 10, 2016 3:57 pm    Post subject: Reply with quote

I just use regular, runs great, occasionally bang a super in for the hell of it Thumb
 
  
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grbspeedster
Nürburgring


Joined: 11 Nov 2007
Posts: 430
Location: Rugby


PostPosted: Sat Dec 10, 2016 6:21 pm    Post subject: Reply with quote

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
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