The G4003G manual will direct you to do a 1.25 hour spindle break-in before you start turning things. After that, it will direct you to change out the headstock oil.
So now is the time to buy some.
I like to buy it from Use-Enco.com. You can get good deals on Mobile Vactra-2 oil (for the ways) and Mobile DTE Light (for the headstock) and if you chose the right time (coupon and free shipping), you can save a lot of money. They generally have a 15-20% off coupon every week or two. They had a 15% off & free UPS shipping that ended yesterday.
Vactra-2 is on sale this month for $18/gallon, and they have free UPS shipping all month.