Thanks for the reply guys, Zoren, not sure where FL is (Florida perhaps?) but $50 is extremely cheap! I do drive her hard every day, but the heat and dust don't help, the last three months the average daily temperature has been 44C or 111F so it takes its toll on the car. I can only really push her for a short period of time as the oil temps start to rise quickly.
In the end I managed to get a discount so the price came down to $450 which I think isn't bad, coming from the UK and curiously asking a local Nissan dealer for a quote the price was over $1000 so this I consider very good value for money. Thats why we call them "stealers" in the UK