Direct injection gasoline engines generally sound like diesel engines (as the direct injection is an off-shoot from diesel engine technology).Just watched this video https://youtu.be/b4fyJV00OuQ, towards the end of the clip you hear the engine with the bonnet up. I am no expert but it sounds very like my 250 Cdi!?:surprise:
A few of us who had to use 95ON in Scotland will testify to that.Direct injection gasoline engine: Pros and Cons of Direct Injection Engines - Consumer Reports
More reason to use Top tier fuel and use Techron Concentrate on a more regular basis.