SINGER W1550 - Manual (Page 44)

OILING
As is the case with all precision machinery, it is necessary for maximum efficiency
to properly oil and clean at reasonable intervals. Even though the machine is not
in constant use, it is important to oil your machine since the oil will dry after
standing over a period of time. Use a good grade of sewing machine oil.
NOTE: Before oiling, clean away all lint or foreign matter. One or two drops of
oil are sufficient at each point.
The machine should be oiled at the arrow points shown. After you have
cleaned and oiled your machine, it is advisable to run the machine at high
speed so that the oil will penetrate all moving parts.
: After cleaning and oiling machine, wipe away all excess oil and sew on a
scrap of material to be sure machine sews cleanly.
Inside Face Plate
Sewing face plate open and
oil all moving parts at
friction points.