1993 Oldsmobile Silhouette Owner's Manual - Page 66
1993 Oldsmobile Silhouette Manual
Page 66 highlights
Features & Controls Engine Block Heater (CONI) be sure to store the cord as it was before, to keep it away from moving engine parts. If you don't, it could be damaged. How long should you keep the block heater plugged in?The answer depends on the weather, the kind of oil you have, and some other things. Instead of trying to list everything here, ask that you we contact an Oldsmobile dealer in the area where you'll be parking your vehicle. The dealer can give you the best advice for that particular area. ungrounded outlet could cause shock. Also, the wrong kind of extension cord could overheat and cause a fire. You could be seriously injured. Plug the cord into a properly grounded three-prong 110-volt outlet. If the cord won't reach, use a heavy-duty three-prong extension cord rated for at least 15 amps. ~