90 degree V6 with additional balancer gears will never idle as smooth as an inline 6. you can get the same smoothness in a V if the engine were 60 degrees.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)