I don't think the higher octane gives any measurable increase in horsepower, but it seems to me that the engine is more tractable and puts down what power there is more smoothly, on the other hand, you might be right, it could all be in me head! A lot of people do report better mileage using the higher octane fuels though, and I guess for most that represents a saving worth having even setting it against the higher cost at the pump.
One of these days I will have to do a comparison check and see if there is indeed more miles to the gallon. Something else I have to check out as my everyday wheels are diesel, is whether or not adding 300ml of two stroke oil to a tankful gives any improvements there.
To all interested:
due to the pollution control measures of the EC diesel-oil is nearly sulphur free and contains up to 5% of bio-diesel. Sulphur has the property to grease the high pressure injection pump and the injectors. Without sulphur, the reduced greasing property of the new diesel has already shown negativ impacts on the long-term stability of the injectors and the high pressure pump. The pump manufacturers have tried to react by lining the moving parts of the pumps with teflon or other suitable material. However, the long term stability is still not achieved as with the old (sulphor contained) diesel.
The engine-research centre of a well known German car manufacurer has conducted some long term tests of diesel additives to find out whether any one of them will have an impact on the long term reliability of the diesel engine components. This introduction to explain were my information comes from.
The results of this research: any diesel additive of any manufacturer presently on the market is not worth the money!
BUT: 2-stroke oil, which we use in our motor saws, lawn mower or in 2-stroke motor engines has shown to have an extreme positive impact on diesel engines, if such 2-stroke oil is added to the diesel in a homoeophatic dosis of 1:200. In practical terms: 0,300 litre of 2-stroke oil into the 70l diesel tank. The 2-stroke oil will be absorbed by the diesel (emulsion) and grease every moving part of the high pressure pump and the injectors.
Besides this, the 2-stroke oil will keep the diesel engine clean, as it burnes cleaner as the diesel itself.
In other words, the 2-stroke oil has a much lower ash-content as diesel, when burned. This proven fact delays the DPF (diesel particulate (soot) filter) to clogg, and the "burn free" process of the DPF will be much less.
One more information: in Germany we have to present our cars every 2 years to the TUV -Technical Supervision Organisation - who will check, amongs others, the pollution of petrol and diesel engines.
The measured cloud-factor of a diesel engine without use of 2-stroke oil has been 0,95.
The same factor with the use of 2-stroke oil has been 0,47 - reduction of nearly half of the soot particles.
Besides this, the use of 2-stroke oil in the diesel will increase the milage by 3-5%. [Quote]
I did a lot of reasearch on 2 stroke oil in diesel engines.
It seems our american cousins are already wise to the benefits of a drop of 2 stroke oil.
Anyway the science is well proven , it burns more completely than diesel , reduces engine smoke to virtually nothing , cleans the combustion chamber , it appears to lubricate the egr valves to close more evenly.
(I had a lazy egr valve one side but it's not lazy any more)
You can buy 2 stroke oil cheap enough on ebay , from wilkinsons or b+q.
I've used it for a few months now in my RRS and the wifes A4 tdi.
Much quieter when cold ,much better throttle response . no smoke unless I drive like a test pilot when I get a light haze from the pipes instead of the smoke I used to get.The throttle response is thebig difference.
It is more lively and the gearbox doesnt hunt up and down at all.
just 300mL of 2 stroke oil in a full tank really does give you wings.
I've got my dad using it in his Mitsi L200 navvy wagon , same story.
Neighbours ford focus , different motor!!
Mates escort diesel van 1.8 , much smoother +quieter.
Any questions ask away , I've had such success I thought it was my duty to report it.
I've done a fair bit of research for bulk buying , I wont post it as it might be construed as commercial posting.
It's such a small percentage of the full tank it can do no damage and dissolves completely.
I dont see how we can lose. [Quote}