[Mosaud1998]

I noticed that my E90 lightly vibrates when I start it in the morning and the engine reaches operational temperatures. Not a cold start. But, yesterday I filled the tank up with premium gas (ofc) and some techron fuel injector cleaner and the car doesn't vibrate anymore. Is that light vibration normal? I'm wondering if I'll have to keep adding Techron every time I fill up now so that light vibration goes away. It's a very very light vibration. Hardly noticeable unless you sit in the car for a few minutes. It doesn't vibrate when idling at a light or stop sign