It would be wise to have the machine cleaned & serviced. Do you have a manual for it? Did it come with oil at one time? I found a free manual at
http://homeappliance.manualsonline.com/manuals/mfg/singer/7442.html
You have to register (free)...choose to skip the popups (2)...and you can save the manual to your hard drive.
I checked the manual...you don't need to oil the machine...but page 61-63 shows cleaning...and it's basic. You take the two screws from the throat plate, remove the bobbin case & brush the inside of the machine bed out...I use a small artists plastic bristle brush, or a small childs tooth brush.
Hope this helps.
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