Hi I'm Jake got a e60 m5 and when I'm driving in msport and giving it some my engine management light comes on and says half power if I turn the car off straight away and restart the light is still on but if I let it cool down for 5 mins the light is gone and car is fine again untill I drive it msport and when light is on engine runs a little bit hotter but when I'm not in msport the light does not come on

 

You will have to get the code it is throwing before someone can help. It could be alot of things that cause your issue....

 

4500 RPM redline, DSC Malfunction, ABS Malfunction, Start-off Assistance Malfunction, Reduced power errors? If so most likely a throttle actuator. Need to have codes read to be certain.

 

I replaced both actuators and AC compressor clutch and belt drive system. Also are you using quality oil? I use Liquid Moly 10w 60.......I'm also going rebuild my Vanos units ,the seals and the bearings need replacing.

 

What bearings and seals? The S85 VANOS has no serviceable components other than the solenoids.

 

Inside the dual vanos units? I was told that the seals in the units wear out over time, and bearings in the unit.. dont know the technical terms, but have seen the parts, and process.... but thanks bud