Volvo 780 Owner's Manual page 94

1987 Volvo 780
Fluid type: DOT 4
Replace: every second year or 30,000 miles (48,000 km). The brake fluid should be replaced once a year or every 15,000 miles (25,000 km)
when driving under extremely severe conditions (mountain driving etc.)
Check, without removing the cap, that the level is above the "MIN" mark of the fluid reservoir.
Always entrust brake fluid changing to an authorized Volvo dealer.
pg. 93 Engine oil
Checking the oil level
The oil level should be checked each time you refuel. Be sure the oil level is maintained between the upper and upper 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: 6.3 US qts - 6 liters. After an oil change, the oil level will lie between the two marks on
the dipstick i.e. between MAX and MIN. This is normal. Do not add too much oil or excessive oil consumption will result.
Changing oil filter
Replace the oil filter at every change.
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