1999 Subaru Impreza Owner's Manual - Page 219

Starting and operating as rough roads or off roads will necessitate more frequent replacement of engine oil, brake fluid and transmission oil than that specified in the maintenance schedule described in the Warranty and Maintenance Booklet. Remember that damage done to your Subaru while operating if off-road and not using common sense precautions such as those listed above is not eligible for warranty coverage. Winter driving HG0315 J Operation during cold weather Carry some emergency equipment, such as tire chains, a window scraper, a bag of sand, flares, a small shovel, and jumper cables. Check the battery and cables. Cold temperatures reduce battery capacity. The battery must be in good condition to provide enough power for cold winter starts. Use an engine oil of proper grade and viscosity for cold weather. Heavy summer oil will cause harder starting. Keep the door locks from freezing by squirting them with deicer or glycerin. Forcing a frozen door open may damage or separate the rubber weather strips around the door. If the door is frozen, use hot water to melt the ice, and afterwards thoroughly wipe the water away. - CONTINUED- 7-37