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Gas
Do most of you guys use the 93 Octane in your 928's? That's what I have been using in mine, occasionally the 92 if that is all I can get.
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1986 928S 32 valve engine All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires. Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L. Latest addition: 2000 BMW Z3 Roadster |
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04-30-2010, 12:47 PM
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The Stick
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91 is highest we have around here.
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Richard aka "The Stick" 06 Cayenne S Titanium Edition |
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04-30-2010, 02:37 PM
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Moderator
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91 here too. I also heard that running a high octane gas doesn't help us as our engines aren't high compression. Someone will chime in and verify this.
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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04-30-2010, 03:24 PM
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Registered
Join Date: Jul 2001
Location: Wilmington, NC USA
Posts: 635
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Compression ratios varies by year and model from a low of 8.5: to 10.4: 1. As for the recommended octane:
From the WSM: 79-84 US 91 RON 85-86 32 V 96 RON 87-88 95 RON- Australia 91 RON 89+ 98 RON The pump octane in the US is an average of RON(research octane number) and MON(motor octane method). Add 4 or 5 points to the pump octane number to get RON. The early cars only needed 91 RON so regular should be okay. The later cars need premium unleaded.
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69 911 2.3Ez 85 928S |
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04-30-2010, 05:18 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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Lowest that doesn't ping is best. No harm I know of from higher octane, except it does have less energy so mpg might be lower.
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04-30-2010, 06:04 PM
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Registered
Join Date: Jun 2007
Location: Pittsburgh, PA
Posts: 650
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good old regular is all you need for a stock US model up to '85.
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Ed 85 928 5 spd (guards red over tan) 07 Shelby GT500 6 spd (torch red over two tone black and red leather) |
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04-30-2010, 06:22 PM
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1994 Porsche 928 GTS
