Thanks for the clarification guys.
Will look into getting some Mobil 1.
Fitted the alternator last night, what I mean is that my talented mechanic fitted it.
We managed to get it out from above by removing the coolant expansion tank and a few cables.
Only had to go underneath to to undo the main bolt or the tensioner I can't remember.
Thanks for your message Andy, expect a reply soon!
Car drives lovely for it, the voltmeter on the dash is giving much lower readings than before so I assume it will need resetting with the tweezers, a job I'm not gonna rush into.