1993 Oldsmobile 88 Owner's Manual - Page 60

I Plugging the cord into an ungrounded outlet could cause an electrical shock. Also, the -r:ong kind of extension cord ,,uld overheat and cause a fire. You could be seriously injured. Plug the cord into a properly grounded three-prong ll0-volt outlet. If the cord won't reach, use a heavy-duty three-prong extension cord rated for at least 15 amps. Alter you've used the block heater, be sure to store the cord as was it before, to keep it away from moving engine parts. If you don't, How long should you keepthe block heater plugged in? The answer depends on the weather, the kind of oil you have, and some other things. Instead trying of to list everything here, we ask that you contact an Oldsmobile dealerin the area where you'll be parking your vehicle. the The dealer can give you best advice for that particular area. 59