Some time ago now I had my 3lt V6 completely rebuilt. It wasn't built to use unleaded fuel though. Now that I can finally drive it, the builder told me not worry about using any additives in the fuel and just use premium unleaded. I'm not quite sure if I should be doing this or not, So if anyone knows anything about this subject, I'd like to here your thoughts. Thanks guys

Ooh,
 
I'd be careful there - without hardened valve seats I would definitely be using some sort of valve train lubricant additive.
 
I've got a nissan patrol on gas and I just picked up one of the flashlube sets from supercheap for $72.
 
It's got a bottle, mount and adjustable valve so you can mount it in your engine bay, hook it up to a vacuum line, set the drip rate and forget... Until you have to refill the flashlub bottle that is...
 
That's my 2 cents, but maybe somebody else out there might be a bit more knowledgable...

gtmadness

Some time ago now I had my 3lt V6 completely rebuilt. It wasn't built to use unleaded fuel though. Now that I can finally drive it, the builder told me not worry about using any additives in the fuel and just use premium unleaded. I'm not quite sure if I should be doing this or not, So if anyone knows anything about this subject, I'd like to here your thoughts. Thanks guys

 
If the builder is telling you not to then I would listen.  If I'd told you not to run it, and you went ahead and did so anyway and had a problem further down the track, then it would be your problem.
 
IMO, I completely agree with him.  Unless you're planning on doing big klm's it won't be an issue, and I am yet to see an adative that isn't detrimental to other areas of the engine.  Any engine that I have dismantled that has been run on any form of "valve saver" or similar has horrible deposits on the valve stems (to a point wear the valve sticks) and in the combustion chamber (causing detonation), and I would say in almost all of the the cause of the engine wear/failure to start with.  I would run a good quality 98 premium with no adative.
 
Cheers
Woz

If it's definitely not built for unleaded fuel then google 'octane supreme' or 'octane supreme 130' and use that.  Not as cheap as some alternatives but if you're  not doing heaps of miles  then cost is not a major concern. Once you read what it is you'll see why it is recommended.  Available here in Vic, not sure about SA
rgds, SFE

SFE

If it's definitely not built for unleaded fuel then google 'octane supreme' or 'octane supreme 130' and use that.  Not as cheap as some alternatives but if you're  not doing heaps of miles  then cost is not a major concern. Once you read what it is you'll see why it is recommended.  Available here in Vic, not sure about SA
rgds, SFE

 
Don't get caught running it though, EPA notice and up to $10,000 fine...........
 
Agreed, good for the engine, but unless you're doing big klms not needed
 
Cheers
Woz
 
 

Not the full story Warren.       The retailer claims to have obtained after long drawn out process approval to sell for road car usage, with a number of restrictions including labelling not to be used in engines designed for unleaded fuel ie cat vehicles, Maximum dosage not exceed certain levels (there is even a legislated maximum level by the minister), proof of older vehicle ownership at POS eg CH logbook, the usual flammable toxic & carcinogenic warnings, dosage guide, MSDS availability etc.
Having said that,  it's still up to the user make his own enquiries, put it in the correct vehicle and satisfy himself on the legalities, dosage etc.  Bit different to being caught running say "blue" fuel (AV gas) by the EPA and copping the fine 
rgds, SFE 

SFE

Not the full story Warren.       The retailer claims to have obtained after long drawn out process approval to sell for road car usage, with a number of restrictions including labelling not to be used in engines designed for unleaded fuel ie cat vehicles, Maximum dosage not exceed certain levels (there is even a legislated maximum level by the minister), proof of older vehicle ownership at POS eg CH logbook, the usual flammable toxic & carcinogenic warnings, dosage guide, MSDS availability etc.
Having said that,  it's still up to the user make his own enquiries, put it in the correct vehicle and satisfy himself on the legalities, dosage etc.  Bit different to being caught running say "blue" fuel (AV gas) by the EPA and copping the fine 
rgds, SFE 

 
Thats interesting, who is the Aus distributor?  I would be keen on giving some of this stuff a go in some vehicles I have floating around for some testing.
 
Cheers
Woz

Thanks guys for your input, this helps greatly