My diesel I6 W126 is silk smooth at idle, you can feel vibrations through the steering wheel but thats it.

Change your engine mounts, make sure the engine is idleing right.

You should almost not know the engine is on with a V8 W126.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200