Ok here goes, firstly prolong AFMT is not an oil treatment it is a metal treatment that uses the oil as a carrier to get it round the engine, from all the advert bumf it claims to bond at an ionic level with the metal components within the engine and effectively reduce friction and heat etc, the reason I tried this product was to try and reduce the piston slap I had on my ver 3 sti after its rebuild, I had tried all sorts of oil of various viscosity and ended up using a 5w50 fully synthetic which gave the best results, but the piston slap was still there only not as bad as with a 10w or 15w oil, I then looked into the Prolong AFMT I was at first very sceptical about it but after reading into it they have been around for ages and have loads of good feed back, so I bit the bullet and decided to give it a go, I mixed a batch up with my 5w50 oil at 15% to make the required 4.5 litres to fill the engine after a full oil change, then started the car up and let it warm up, at first there was no real difference and decided to take it for a bit of a run, whilst out on the run the engine responce was smoother and sharper than normal especially the turbo responce (visible on Apexi Avcr) and when I returned from the drive and had a close listen to the engine the overall noise was greatly reduced even on cold start the following day, if I had to put it in % how much of an improvement it had on my piston slap/engine noise over the oil alone it would be atleast 70% better. I can honestly say it is no placebo effect it really does seem to do what they claim it does, I will be trying it in my gearbox/diffs very soon too as it can be added to any oil
At the end of the day if it was no good or I saw no improvement I would not have posted up in General how good it was.
Hope this helps
Cheers Iain