[Hit_Apex]

For the 20.6km lap measurement:

M4 CSL - 7:13.492
M3 CS - 7:23.975

The M4 CS should be a couple seconds faster than the M3 CS - BMW should reveal soon as they've already recorded it. A G81 CS would be around 7:28 if ever produced.

Edit: To help with the massive amount of confusion in the car world. It is very uncommon for a non-manufacturer to post a full lap time as it requires a closed track and renting it is very expensive. So, a good rule of thumb is that any media test is going to be 20.6km and very few cars will have full lap times announced. I think the boys at M are ring purists and it’s a flex to record a 20.8km time (see the GM debacle over the Camaro 1LE where they announced 7:16 ish for a full lap but their video shows a 20.6 start and later took down the video).

For education, the finish line is the same for both. The 20.6km start is at the end of the straight in front of the T13 stands - the wall currently lined with M colors. Any time you see a video where the clock starts just before a hard left, you know it is a 20.6km lap.