Menu toggle

993 fuel

T

Tiptronic2

New member
At the question time meeting last weekend I was speaking to someone who thought there should be no problem in routinely running a 993 on normal unleaded fuel. I had always thought that this should be avoided at all costs. I wondered what other owners thought on this. Just how much damage might you be doing to the engine if you use the occasional tank full or normal unleaded?

 
Yep, I think I was talking to him too, he is right, the car will run on 95ron, because the system will compensate for variable fuel, if the correct grade is temporarily unavailable, but the correct fuel for 993 is 98ron, I have not found any advantage in running 95 (including cost!!) and the car runs so much sweeter on 98, 99 is even better , I find the"branded"fuel better than supermarket also .
 
I agree. Mine has run on standard unleaded for years without problem but I like to use high octane occasionally. Never put supermarket fuel in it though.
 
From what I understood, the 'knock sensors' will adjust the ignition timing to compensate for standard unleaded. So it's more an issue of reduced performance that engine damage.

Regards
Anton
 
Hi

I agree with Antons statement - the car will run on the standard Unleaded but the performance will be retarded due to the lower octane rating of the fuel. The engine automatically compensates for this type of fuel - however it obviously performs far better on super unleaded (99RON if possible -Tesco's garages tend to stock this).

Not sure about the difference between Supermarkets and branded fuels? Possibly to do with the water in fuel issue that hit Tesco's several years ago? Don't think I'd fill up with standard unleaded at a supermarket though (I guess that I've kind of contradicted myself there!! [&:])

If I can't get the higher octane super unleaded then I will top up with normal - but in the normal course of events I would always plump for the super unleaded...it is only 7 - 8p per litre more expensive and it is what the car engine was designed for.

Down to personal choice I think really.
 
I have always run mine on V power 99 as well. It sounds like the consensus is that in an emergency the occasional tank full of standard unleaded (non-supermarket) should not cause any damage just a temporary loss of power.
 

The 993 engine will run quite happily for ever on 95 RON, however, fuel economy and performance will both suffer as a result. It can even be run on 93 RON in emergencies for short periods and taking it easy.

I don't think there's any real point in putting the occasional tank of 98 or 99 RON in as I believe the engine management takes a fair while to adjust fully to the higher octane fuel.

Fuels like V power also have better additives to clean the combustion chambers, fuel injectors, etc (allegedly)

 
I've always found putting lower ron fuel in performance cars is a false economy as the fuel consumption is usually better with the higher ron fuel.
 
Trouble is, you can't buy 98 Ron in the UK any more. (unless anyone knows different). Shell, ESSO, BP, Waitrose etc are all 97 nowadays, so it's Tescos for me. I use 97 a lot, bit I don't like it. I would never use 95, as your retarding the ignition, which can't be good.
 
just my two pence worth, but 4 the ignition to retard to run on lower octain fuels,the knock sensors on the cylinders have 2 hear a knocking,which surely cant be a good thing even for a short period.
 
Maurice has sumed it up perfectly, if we all value our engines, which we do or we would not be on here,running on low octain fuel could well end up costing us far more in the long run in engine rebuilds than the few pence a liter we save in the short term. and in theory running on higher octain should give us more miles 2 the gallon,so it works out no more expensive than the lower octain stuff in the end.and we dont have to worry about damaging our engins.
Detonation is bad news in any engine

In case anyone has spotted that i seamed to have contradicted myself in a post further up,which says i on occasions top up with 95,it was my brother who wrote that, as while he is a club member & 993 owner,he used my account by mistake & i did not spot he had posted,till after i put my two pence worth in.just thought id clear that up :)
 
I've seen a BP lorry restocking our local Sainsburys on more than one occasion so I have no problem with using their SUL
 

ORIGINAL: Porker993

Trouble is, you can't buy 98 Ron in the UK any more. (unless anyone knows different). Shell, ESSO, BP, Waitrose etc are all 97 nowadays, so it's Tescos for me. I use 97 a lot, bit I don't like it. I would never use 95, as your retarding the ignition, which can't be good.
Click to expand...

Shell V-Power is now 99 Octane ( it used to be 98 when it was branded as Optimax) It's also the only UK fuel that is refined specifically at a higher octane - all the 97 Octane fuels are standard 95 Octane with an enhancer added, which is why BP can provide SUL for supermarkets.

My attitude is that I paid a lot of money for Porsche engineering, and yes it will run on 95 Octane, but why not run it as the designers intended, the additional cost is pretty marginal in the overall yearly cost to keep a 993 going

Pete
 
ORIGINAL: burrow01

My attitude is that I paid a lot of money for Porsche engineering, and yes it will run on 95 Octane, but why not run it as the designers intended, the additional cost is pretty marginal in the overall yearly cost to keep a 993 going

Pete
Click to expand...

That sums it up in a nutshell Pete
 
V power has to be the right choice - ran mine on Total Excellium ( 97 Oct. I think ) for a while as Shell garages are not close. Difference on V power is very marked and I now go out of my way to use it.

Andrew W.
 

ORIGINAL: sue11sam

hmm how much more milage is there in this topic ? how well do they run on 30sec fuel [;)][;)]
Click to expand...

So is no one up for the challenge of trying the 30sec fuel oil in there Porsche ? ;-)

Could try malt whiskey,probly works out cheaper than using petrol these days ;-)
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top