I changed the oil in my S2000 and E430 about 2-3 months ago. Both cars had a mix of Castrol Edge 60% 0W40 and 40% 5W20 to get a thick xW30. Also, both cars had 1/3 can Liqui Moly MOS2.
Everything was okay, both engines were very smooth for several weeks. Suddenly the E430 engine made some noise at idle but no noise at higher RPM. While driving the engine was very quiet but as soon as the foot was off the gas pedal the terrible noise came back.
Last week I added 1/2 can Liqui Moly MOS2, after driving around 10-15 miles the noise was gone and as of today it didn't came back. I have no idea what make the engine sound so terrible, but as of today I am happy that I had spare can of MOS2 and it cures the noise.
Everything was okay, both engines were very smooth for several weeks. Suddenly the E430 engine made some noise at idle but no noise at higher RPM. While driving the engine was very quiet but as soon as the foot was off the gas pedal the terrible noise came back.
Last week I added 1/2 can Liqui Moly MOS2, after driving around 10-15 miles the noise was gone and as of today it didn't came back. I have no idea what make the engine sound so terrible, but as of today I am happy that I had spare can of MOS2 and it cures the noise.