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Old 12-03-2007, 09:54 PM   #1
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Fuel (Gasoline) Question?

I may have access to some 100 octane low lead gasoline (AVGAS) and was thinking of using some in my Boxster S.

Can any tech heads or fuel experts tell me;

Can I use this fuel?

What percentage can I use (i.e. adding X gal of 100 octane to Y gal of 95 or 91 octane each tank?

Thanks

-Scott

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Old 12-03-2007, 10:25 PM   #2
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100 octane "Streetblaze" Unleaded is A-OK. Unleaded 100 aviation fuel is A-OK. Low Lead aviation fuel will kill your cats quick and long term use could damage your motor. Not recommended.
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Old 12-04-2007, 05:06 AM   #3
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There won't be a difference between it and regular premium gas. Save yourself some $$ and just use premium.
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Old 12-04-2007, 07:33 AM   #4
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Originally Posted by rick3000
There won't be a difference between it and regular premium gas. Save yourself some $$ and just use premium.
+1

Spark, compression and valve timing are set to optimize the combustion kernel initiation of 93 octane fuel. Higher octanes won't gain anything.
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Old 12-04-2007, 09:30 AM   #5
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Rob Falkner did some testing last year on his Boxster S and found a slight gain running high-octane street-legal (unleaded) fuel in his dyno testing.

It was such a small difference you'll never notice it, though.
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Old 12-04-2007, 10:09 AM   #6
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Quote:
Originally Posted by ozspearo
I may have access to some 100 octane low lead gasoline (AVGAS) and was thinking of using some in my Boxster S.

Can any tech heads or fuel experts tell me;

Can I use this fuel?

What percentage can I use (i.e. adding X gal of 100 octane to Y gal of 95 or 91 octane each tank?

Thanks

-Scott
Unless you have big engine mods or can only get 91 like here in So Cal forget it. Above the manufactures recommendations is worthless in any car, definitely not worth $7+ a gallon.

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Old 12-05-2007, 07:59 PM   #7
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Thanks all. I wasn't actually going to pay for the fuel, someone was going to give it to me as it will be left over from a project , but given the comments here I don't think I'll bother. I have access to 95 Octane at a place just out of town at $4.89 a gallon so I normally use that. Think I'll stick with the 95 with the occasional tank of 91.

Cheers,
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Old 12-06-2007, 06:32 AM   #8
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Quote:
Originally Posted by ozspearo
Thanks all. I wasn't actually going to pay for the fuel, someone was going to give it to me as it will be left over from a project , but given the comments here I don't think I'll bother. I have access to 95 Octane at a place just out of town at $4.89 a gallon so I normally use that. Think I'll stick with the 95 with the occasional tank of 91.

Cheers,
Well, if it's free, go for it.
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Old 12-06-2007, 07:24 PM   #9
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It's free but......

But a new engine isn't!

Just to reiterate, it's 100 octane low lead fuel, not unleaded. I don't know anything about fuel, so I don't know the difference, but given the other problems I have with the car at the moment (and their cost), and the lack of benefits of using this fuel, I think I'll avoid it.

Thanks again for everyone's replies. Feel free to add more if anyone has extra info.

Cheers,

-Scott
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Age shall not weary them, nor the years condemn.
At the going down of the sun and in the morning
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Old 12-07-2007, 06:43 AM   #10
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lead, any amount = BAAAAAD.

Do NOT use 'low lead' fuel in your Boxster.
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Old 12-07-2007, 09:52 AM   #11
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Originally Posted by ozspearo
But a new engine isn't!

Just to reiterate, it's 100 octane low lead fuel, not unleaded. I don't know anything about fuel, so I don't know the difference, but given the other problems I have with the car at the moment (and their cost), and the lack of benefits of using this fuel, I think I'll avoid it.

Thanks again for everyone's replies. Feel free to add more if anyone has extra info.

Cheers,

-Scott
Sorry, I missed the low lead statement. Definitely a no no.

FYI though, it won't hurt your engine at all, it will just mess up your emissions equipment.
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Old 12-07-2007, 09:56 AM   #12
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Lead will ruin your cats and will most likely void your emmissions warranty (if you care).
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Old 12-07-2007, 07:14 PM   #13
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It's decided.

Thanks all. I'll be staying away from the 'free' fuel. I appreciate everyone's input.

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Age shall not weary them, nor the years condemn.
At the going down of the sun and in the morning
We will remember them
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