I have a 2015.5 V60 which I will be dropping off for warranty work, an oil change and an alignment. I am wondering what people's experiences have been with the Polestar tune on the 2.0 Drive-E motor? Is the juice worth the squeeze? From what I have read, the tune is essentially a transmission optimization more than a tune. Additionally, the car is at 60,000 miles, should I have the transmission flushed?