The engine should not produce a whining noise. It may be audible from the outside, but it should not be heard from the inside. Initially, I was surprised by how quiet my vehicle was inside, especially while driving at high speeds on the road. Minimal wind noise, mostly tyre noise, with the engine remaining quiet until acceleration, at which point the V8 sound may be heard in the background. The performance may be described as rather satisfactory. There have been occasions when I want more and regretted not getting the 5.5 instead π The M113 5.0 is quite durable. Transitioning from a turbodiesel engine to a petrol one may result in a perceived decrease in middle power, since petrol engines need higher revs to generate power compared to the torque surge seen in turbodiesels. I wouldn't use it for a daily 4-mile commute to work since the engine wouldn't reach its optimal working temperature.