Three-time DTM champion Rast will compete for BMW in a variety of GT3 races and championships this year, having ended a decade-long association with rival German marque Audi in the wake of its decision to scrap its LMDh programme.
The 36-year-old got his first experience of BMW’s GT3 contender as part of a two-day private test at Oschersleben last month and logged more miles in the M4 in the official DTM test at Spielberg a fortnight ago.
Rast said after his first outing at Oschersleben that he was having to completely change his driving style to adapt to the M4, which is a completely different car to the Audi R8 LMS GT3 he is accustomed to from his time with the Ingolstadt-based manufacturer.
Now having had two more days of running in the car, Rast said he still needs to put in more work to be able to match the pace of reigning champion Sheldon van der Linde, who will be his team-mate at Schubert Motorsport this year.
"You can never tell if the point will come that you really drive on the same level as Sheldon," he says in an interview with Autosport’s sister title. Motorsport-Total.com.
"I hope that at some point the BMW will fit me like a glove, but it's not certain that that will happen. I'll do everything I can, but unfortunately there's no guarantee.”
Source: Autosport