I'm guilty of taking my 335is convertible to the automatic car wash and it does not have any leaks. It's tight as a drum, fortunately.
We have a very good local car wash that has not caused any damage to any of our cars or SUVs in 15 years . Most of the area dealers take their new cars there for prep and detailing.
After the car wash, I bring them home and do a complete detail with either Lucas Slick Mist or Meguiar's Ultimate Spray Detailer.
No scratches or swirl marks, or etc.
The only car I don't take to the auto car wash is my ZO6 because it is very low to the ground in the front and the wheels/tires are very wide. Plus, it's just a really cool car!
'12 Porsche 911 GTS Cabriolet; '11 BMW 335is Convertible; '08 BMW 535xi (family vehicles - '11 E90 M3; '11 Audi S4; '08 Chevy Tahoe; '02 Chevy Suburban)
Favorite Cars Gone But Not Forgotten:
'09 Corvette ZO6; '04 MB S600; '01 BMW 740iL; '90 Nissan 300ZX 2+2; '89 Jeep Grand Wagoneer; '79 BMW 320i; '79 MB 300D; '67 MG Midget