2 qts
0w=40 synthitic
2 qts
About 5.5 quarts
Back of the engine, next to the distributor.
If you drive normally I recommend every 5,000 miles.
The Oil Pressure Switch (Oil Sending Unit) is located on the rear of the motor towards the top. The crank sensor is located next to it if that helps any.
The oil capacity for a 1986 BMW 325 is 4.3 quarts.
No you can't used 10W-40 in the Trans either the transmission oil or you could go with Mobile 1 synthetic
For a manual transmission, just plain ol' motor oil; shop manual says SAE 10W-30 or 10W-40 oil rated SE or SF...
No, that's caused by oil problems (sludge, foam, improper oil change schedule) or sometimes just plain engine age.
Because You Are Out Of Oil