Normally oil changing only needs to be carried out when the transmission is reconditioned. The oil level, on the other hand, should be checked after every 10.000 km (6.000 miles).
The vehicle should then stand level. Move the selector lever to position "P" and let the engine run at idling speed. Wipe off the dipstick with a nylon cloth, paper or chamois leather. Do not use waste or fluffy rags.

Oil ATF Type F/G

Specifications and approvals: Volvo 97330; Ford ESW-M2C 33-F/G.

For topping-up, use

RAVENOL ATF Fluid Type F

LIQUI MOLY Top Tec ATF 1300

Engine B 18

Insert the dipstick, pull it up and check the oil level. If necessary, fill up with oil until the level reaches the "MAX" mark. Do not fill above this mark, as this can cause the transmission to become over-heated. The difference between the "MIN" and "MAX" marks is about 0.5 litre (1 pint). 

Engine B 20 and B 30

Insert the dipstick, pull it up and check the oil level. Note that there are different levels for a cold or warm transmission. The text on the dipstick will also remind you of this.

bw35 2

The lower section, 1 and 2, applies to a cold transmission.

The upper section 3 and 4 applies to a warm transmission, which is the case after driving 8-10 km (5-7 miles).

If necessary, fill up with oil until the level reaches the "Max" mark. Do not fill above this mark, as this can cause the transmission to become over-heated. The difference between the "Min and Max" marks is about 0.5 litre (1 pint).

If frequent filling up is found to be necessary, this indicates leakage which must be put right immediately.