BMW has had a busy day. Recently, four of its cars have been spotted testing on the Nurburgring race track. The 2108 Z5, 2018 M5, 2018 X3M and the 6/8 series are all camouflaged, but seeing them all driving in a day is a sight to see.

The famous track in Germany is a playground for car testing, so a car or two in camouflage is a usual sight. Camouflages, though, do not mostly keep the make of the car hidden, so the Nurburgring is also a source of leaks. This time around, BMW's newest convertible, sedan, coupe and SUV have all been seen strolling around the track.

The BMW 6/8 series that was just spied is an early prototype. The coupe is an ordinary model, meaning it is not an M Performance variant. However, it is still primed to be a powerful car as the testing revealed that it has a V8 engine. Whether it is an 6 or 8 series, though, remains to be seen.

The 2018 BMW X3M's prototype, on the other hand, is the bulkiest of the four but the best-sounding of them. In the video below, the SUV racing down the track is making a nice note. All cars were driving at 50 to 75 percent of their speed, and as can be seen, the vehicle is roaring at every turn.

The 2018 BMW M5 is also showing off. The luxury sedan is expected to be the fastest yet with an acceleration rate of zero to 60 mph in around four seconds. The design cannot be determined yet, but as it looks now with all that camouflage coating, there are not much difference than the current M5.

Lastly, the 2018 BMW Z5 (as seen on its header) is still a prototype, so the aero elements spotted on the Nurburgring may not appear on the final product. It would also seem that the sports car has moved on from a metallic top to a canvas roof, reminiscent of the Z3.

Production dates for the 2018 BMW Z5, 2018 BMW M5, 2018 BMW X3M and the BMW 6/8 series are still unknown. But because of their several appearances, an announcement is expected to come soon.

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