Hi Guys, In all my previous cars I have used 20% tint with no problems with insurance, rego or the men in blue. Yesterday I have tinted our ZRE with the same 20% tint, however the tinting place cautioned me about some type of films that are blocking the radio reception when the rear window is tinted, as it has a built-in Am/FM antenna lines going through, so be sure to ask your tinting place if the film they're using is compatible with built-in antennas in the glass. And BTW, we had a Nissan Tiida that was tinted in 20% and my wife had a huge accident, so the car was written off as a result, the insurance claim was approved on the 2nd day with no problems about the tint on the car either. Obviously it wasn't the cause of the accident and had the accident taken place at night, maybe it would have been a different story. I would not recommend anything darker than 20% as it would be a nightmare driving at night with it.