Gallery: BMW unveils its DTM liveries for 2019

It's taken him a while to emerge as a consistent title challenger, but in the final year of DTM's Class One ruleset, Nico Muller has smoothed the rough edges and has double champion stablemate Rene Rast working harder than ever to keep up in the title race.

It's 20 years since the DTM roared back into life at a packed Hockenheim with a back-to-basics approach as the antidote to its high-tech past. Now it's on its knees again, so is it time to recall the lessons learned in 2000?

Audi last week announced it would be exiting the DTM at the end of 2020, bringing the curtain down on 20 years of continuous participation since the series' reboot in 2000.

Audi's announcement that it will withdraw from the DTM at the end of 2020 was the latest blow for a series that has lost three manufacturers in as many years. Some major soul-searching will now be required to assess how it can survive.

DTM boss Gerhard Berger was a detractor of Formula E and held a reluctance for his series to embrace greener engine technologies. However, this cynic's tune has had to change to ensure DTM's existence as the motorsport world moves forward

Aston Martin's DTM arrival, via the R-Motorsport outfit, was heralded as a salvation of sorts for the series. After plenty of bumps in the road in 2019, the team finds itself in a similar position to the one it was in 12 months ago. Can it get its act together?

The Class One 'Dream Race' staged by the DTM and SUPER GT proved a hit - from a competitive and collaborative standpoint. The next step will be for both parties to ensure a successful trial ends up being more than just that.

DTM organiser ITR has mooted a radical plan for a "truly new and inspiring" future motorsport series. How realistic are its suggestions of automated pitstops and 1000bhp hydrogen-fuelled touring cars?