Hi Fasteddie,
we just repairing an Euro 4 M3W. That one had noises as well. We started to take off cylinder heads and found that all valves have been too hot and now need replacing.
The cause have been both melted pre cats in the exhaust manifolds. Because they are melted, the engine couldn`t get rid of the exhaust gases what did cause that the valves
don`t seal anymore. Just a thought. On those M3W`s everything can happen....
Regards
Frank
Morgan Park
