rsilfverberg said:
How often would you send in a Lecia for CLA?
The only camera I have a regular service plan is my hassey and that's every 18 months.
That's a lot of CLA for a Hasselblad

Mine goes in only when needed, except for the mags, which are on a 3 year schedule to change the dark slide light seals. I am not a great believer in preventative maintenance for photo gear. When cameras break, they get fixed or pitched. Other than that, they get to fend for themselves. The only exceptions are new used high end cameras because I don't know how much use, disuse or abuse they've had. Some of the best items I ever owned were bought cheap in non-functioning condition and brought back by CLA, which fixes almost anything. In fact, the only item I ever sent in for a PM CLA was a Nikon which was duly and permanently botched by Camtronics Camera & Video Repair in Columbus, OH ( Q: How can you tell I am still annoyed by this?).
Leicas can go for decades without service under "normal" use. If they have been exposed to a lot of photo-unfriendly environments, such as sea spray, sand etc., it might be a good idea to have them cleaned soon thereafter. Generally, however, when you get to know a camera well, it's easy to tell if there is something that requires attention.
The best thing you can do for a Leica is to use it. When you let cameras sit too long, lubricants tend to migrate and cause mischief. I am not at all surprised to learn that Gary Winogrand's M4 is still in use, even after the legendary workout he gave it.
There are no guarantees with machinery, however. I once owned a troublesome M4 and a bulletproof Ricoh, so go figure.