Hi guys, I'm using NF Ultra in my GT, I normally buy from the Caltex garage near my house and when pouring it in the tank, it's got a transparent 'honey' colour to it. A month or so ago I couldn't find at the Caltex garage near me so I bought 4 cans from a performance workshop in Brakpan, my problem is that it does not look the same as the Ultra from Caltex. It's more brown in colour and not transparent at all. My question is, do NF Ultra have a certain 'shelf life' or will it start to go 'off' after standing for a while?

Look on the bottle... It says shake well!

The mixture might have been standing for awhile! If you dont shake it, the last few drops going into the tank are quite dark in colour.
That could explain it.
Thats my experience ...

Last time I used it, it was also brown in color?

The can normally goes for a ride in my GT before filling up (that will shake your fillings out) and I shake it as well before putting it in, so I don't know if that can be the reason...