M50 tappet noise (E34 525)

Haven=E2=80=99t read all the posts so probs repeating someone but know that=
 the lifters can make noise if:

1. The wrong oil is used.
2. The oil level is wrong.
3. The hydraulic lifters need sorting.

To bleed the system just get the engine up to operating temperature, then h=
old the revs at 3000rpm for 3 mins. Repeat up to 10 times until the ticking=
 goes. If the Bois persists and you have the correct oil and level, get hel=
p ;)