Four-cylinder engine
Removal
Disconnect the ground wire from the battery.
316i models from September 1988 and 318i models from September 1987: Release both lower engine mounts and raise the engine enough to allow the oil pan to be pulled forward (see section "Removal and installation the engine").
Raise the car.
On vehicles produced since September 1984, unscrew the reinforcing frame.
Drain the oil from the engine (see section "Engine oil change").
Loosen the oil pan mounting bolts.
Remove the lower part of the oil pan; if necessary, carefully pry it off with a screwdriver.
Installation
Clean the contact surfaces of the upper and lower parts of the oil pan. Carefully straighten any bent contact surfaces on the lower part of the oil pan.
Models 316i produced from September 1988 and 318i produced from September 1987.; coat the contact surfaces of both halves with a universal sealing paste, such as Curil.
Glue the gasket with a small amount of grease, check the fit of the gasket.
Install the oil pan and tighten the bolts by hand. Then tighten all bolts to 10 Nm.
If the reinforcement frame was removed, install and secure it.
Fill the engine with oil. There are two marks on the oil dipstick, which determine the oil level in the engine. The difference between the MIN and MAX marks is 1 l.
Lower the car.
316i models from September 1988 and 318i models from September 1987: Lower the engine and tighten the engine mounts (see section "Removal and installation the engine").
Connect the ground wire to the battery.
After the test drive, check the tightness of the oil pan and, if possible, carefully tighten all the bolts.