After reading many posts on this subject both on scoobynet and the Skyline forum i decided to call in a favour from one of my universuty palls.
I dont really want to publish any names but this chap is a chemical engineer that works for a Very large Petrochemical company. I owe him a drink for this. He whent and bought a jerry can full of Optimax and carried out a number of lab tests over a five day period. These were his conclusions, (dont worry i will use plain English)
After using some high tech equipment he can confirm that the petrol was only 97.2 Ron. One of his findings was that Optimax contains many additives one of which is the same as NF. But dont hesitate, its not all bad, Optimax does do a very good job of cleaning internals BUT his tests were not carried out long enough to see if the cleaning action causes harm after prolonged use. The most interesting part of the test is yet to be told, he found that over a five day period the petrol decayed to 95.3 Ron, this would answer a lot of questions for a lot of people. Unfortunatley he couldnt test octane boosters. At some stage he will be as he wants to buy an import and would like the car to run reliably.
Now, these were tests run at a petrochemical labs where some of the equipment that was used costs a hell of a lot of money so i trust the accuracy of these results.
I dont want to put anyone off Optimax as i think its great stuff but only for a short period. Im not telling anyone to stop using the stuff and from my opinion it should be used in small quantities and shouldnt be left in the tank for prolonged periods. These tests were carried out as a favour to me! People should use what they and their cars are happy with. I hope that my friend has been of some assistance. He has im sure, put a lot of our heads to rest and he assures me that when he has time, he will be carrying out tests on octane boosters.