Go to Sew-Classic and buy a tube of TRI-FLOW grease and oil. Lube the gears with the grease and everything else with the oil. The T-F grease is superior to the Singer Lube for gears and works wonders on them. You should also pick up a couple tubes of the Singer Lube for the motors that use it too.
You didn't hurt the machine but the oil you put on the gears will not lube them for long.
Joe