Howdy, sorry we couldnt be of more help, Iv only ever used grease on steering racks, and didnt realse the MG used oil, thats a new one to me.
There are a few MGB owners here, but remember the car has been around longer than the internet, and there are already some well established sites out there with plenty of information.
But if you want to meet other MGB owners, then as Iv said before join the MG car club