Outer Limits 4x4 Board

Hi all
anybody tried this.....it`s a qld based company selling a flushing oil concentrate,is the only product that thoroughly cleans heavily fouled piston rings as well as removing sludge..thay say that they see three litres of sludge removed from cruisers and patrols....
web site www.costeffective.com.au
would like some feedback before buying product..........BB

Search for CEM and you'll find my comments.
Short version - it's good.