Volvo 780 Owner's Manual page 97

1989 Volvo 780
The oil level should be checked each time you refuel. Be sure the oil level is maintained between the upper and lower marks on the dipstick.
Low oil level can cause internal damage to the engine and overfilling can result in high oil consumption. The distance between the dipstick
marks represents approx. 1 US qt (1 liter) of oil.
Draining the oil
Drain the oil after driving while it is still hot.
WARNING!
The oil may be very
hot.
To add or change engine oil
Add oil of the same kind as already used. Capacity (including filter) 6.3 US qts - 6 liters (780); 4.0 US qts = 3.85 liters (78O Turbo)*
*if oil cooler is drained, add 0.7 US qts. (0.6 liters)
Changing oil filter
Replace the oil filter at every change.
pg. 95 Engine oil, 5,000 mile (8,000 km) oil/oil filter change interval
Oil quality
Meeting API specification SF
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