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Lead Replacement Fuel Additives?

Why you using additives Porsche issued bulletin to say 3.2 and I believe SC do not need leaded fuel. Look st service bulletin dated 25/05/99 no 08/99 gives all details i ran my SC on unleaded for over 10 years and my Speedster 3.2 for 10 years + with no ill affects
I always use premium fuel
 
I am probably using additives because they guy who I purchased the car from, did. He said he had used it because the guy he purchased the car from, did. That was the point of the thread.
Also, not everyone has a service station handy which sells premium grade fuel.
 
Ray
you don't need premium I just chose to you can use standard unleaded. I cannot upload but if you want copy of service bulletin pm me with your email and will copy and send to you

 
No Porsche has ever needed leaded fuel as they have always been built with hardened valve seats.
Octane rating is another matter but this varies - remember when the 2.4 911E was launched? I do, and remarkably it was happy to run on 2-star fuel.
Modern fuels achieve high octane ratings without the use of lead which can only be a good thing as it IS evil stuff when injested. The insistence that lead was essential for the longevity of engines was a disgraceful con purpetrated, for various reasons, by the industry.
Of far greater concern, and something that WILL cause damage to air-cooled Porsche fuel systems, is Bio-ethanol. Anything over 5% will eventually rot parts of the fuel system. For this reason, I always fill my Carrera 3.2 with Shell Nitro, which up 'till now is guaranteed not to contain more than 5% ethanol.
 
With the every increasing amounts of that nasty substance "Ethanol" in our fuel. I use "Ethomix" from Frost. I have first hand suffered from a catastrophic fire caused by this stuff :(
 
Yes, I fill up with Shell Nitro/Optimax (whatever it is!) in preference to all others.

FYI, when I saw this thread, I googled regarding BP Ultimate (which I sometimes use at the garage almost on my doorstep) and found the following on their website... quote...

"BP ULTIMATE
BP Ultimate is the highest octane retail fuel that BP has on the market. It has an octane rating between 98 and 100 and does not contain ethanol. It is suitable for all cars but pre-1986 vehicles designed for leaded fuel may need to add an additive to prevent valve seat recession if they do not have hardened valve seats. BP Ultimate also contains a high dose of additive to protect the fuel system and to remove deposits that foul intake valves and the combustion chamber causing poor combustion and knock”.
 
pse_SC said:
Yes, I fill up with Shell Nitro/Optimax (whatever it is!) in preference to all others.

FYI, when I saw this thread, I googled regarding BP Ultimate (which I sometimes use at the garage almost on my doorstep) and found the following on their website... quote...

"BP ULTIMATE
BP Ultimate is the highest octane retail fuel that BP has on the market. It has an octane rating between 98 and 100 and does not contain ethanol. It is suitable for all cars but pre-1986 vehicles designed for leaded fuel may need to add an additive to prevent valve seat recession if they do not have hardened valve seats. BP Ultimate also contains a high dose of additive to protect the fuel system and to remove deposits that foul intake valves and the combustion chamber causing poor combustion and knock”.
Click to expand...
Believe it or not, that ethanol-free statement from BP applies for the whole of the UK except one isolated area - the south west. No, I didn't believe it either so I checked the facts and it is (was) absolutely true. Guess where I live..!
 
Perhaps I'd better switch to BP Ultimate (as I have a SW 98 octane chip) if its 98 - 100 octane cf Shell which states it is 98.
But, on our local BP Ultimate pump, it says 97?? So is there a discrepancy here??
 
i usualy use BP but sometimes SHELL nitro +
Dosent seem any difference realy
someone did say theres less ethanol in BP to SHELL !!!!
the choice is yours.
 
chrishak said:
Kevin Frost said:
First hand experience of Ethanol contamination :( :( :(



Untitled by Kevin Frost, on Flickr

Untitled by Kevin Frost, on Flickr

How it was before...........


Ford Escort MK2 RS Mexico by Kevin Frost, on Flickr
Click to expand...
So I'm guessing the ethanol rotted the rubber fuel pipes, causing neat fuel to squirt onto the exhaust...
Click to expand...


Yes, Thinking is the carbs spat back & ignited the fuel. Had a constant feed from a Facet Red Top so that just fed the fire :( Car was MOT'd the day before & declared perfect. Had good quality braided fuel hoses but couldn't see what was happening to the rubber underneath.......
 
RICHOT89 said:
Perhaps I'd better switch to BP Ultimate (as I have a SW 98 octane chip) if its 98 - 100 octane cf Shell which states it is 98.
But, on our local BP Ultimate pump, it says 97?? So is there a discrepancy here??
Click to expand...
I assume you also moved the fuel switch on your ECU to the correct setting. If not check out SW site for the details
 
I use both Shell and BP out of personal preferences and found no noticeable difference between the two.

On the odd occasion I'm running short or sometimes have limited choice abroad, I have used other 95 rated fuels again with no adverse results.

I do not use supermarkerts own brands though!

 
Beaky said:
RICHOT89 said:
Perhaps I'd better switch to BP Ultimate (as I have a SW 98 octane chip) if its 98 - 100 octane cf Shell which states it is 98.
But, on our local BP Ultimate pump, it says 97?? So is there a discrepancy here??
Click to expand...
I assume you also moved the fuel switch on your ECU to the correct setting. If not check out SW site for the details
Click to expand...
Hi Beaky,

Thanks for your comment and yes the fuel switch has been changed to the correct setting.

Sorry for the tardy reply, just got back this evening from a trip to Tuscany (in an E Type - no ECU here!!).

Richard

 
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