Without knowing too much about this product I can't make a definitive judgement but as has been said before if it's so good, why isn't it recommended by the manufacturers or endorsed by the oil companies esp if they can claim superior lubrication and quality over their rivals?
And as for 'it can't do harm' then look here
http://www.max-boost.co.uk/max-boost/lubrication.htm
and then browse the snake oil links.
Have to agree with tangovictor and lowNslow