928 GT V8-4957cc 5.0L (1989)
Engine Oil: Fluid Type Specifications
Type .................................................................................................................................................................................... SF (Motor Oil, API Service SF)
Mineral base oils
Above 60°F (16°C) ........................................................................................................................................................................................................ 40
32° to 86°F (0° to 30°C) ................................................................................................................................................................................................ 30
14° to 50°F (-10° to 10°C) .............................................................................................................................................................................. 20, 20W-20
Above 14°F (-10°C) ............................................................................................................................................................................... 20W-40, 20W-50
Above 5°F (-15°C) ................................................................................................................................................................................. 15W-40, 15W-50
32° to 100°F (0° to 38°C) ..................................................................................................................................................................................... 10W-40
-13° to 68°F (-25° to 20°C) ................................................................................................................................................................................... 10W-30
-22° to 32°F (-30° to 0°C) ............................................................................................................................................................................. 10W, 5W-30
Below 14°F (-10°C) ................................................................................................................................................................................................ 5W-20
Synthetic base oils
32° to 105°F (0° to 42°C) ....................................................................................................................................................... 10W-30, 10W-40, 10W-50
All temperatures ............................................................................................................................................................................ 5W-30, 5W-40, 5W-50