Mamiya 645 PRO TL - Manual (Page 46)

Special Advice To Professional Photographers
Your Mamiya 645 PRO TL is designed for heavy
professional use and will give you a long service life if
properly maintained. Your camera and lenses have
many moving parts which require periodic lubrication. Its
electronic components, too, are subject to wear and tear
and are affected by ambient conditions like dust, sand,
sea air, heat and moisture.
If cameras had odometers like automobiles. it would be
easier to specify servicing schedules. May we suggest
that if you shoot thousands of film rolls per year, you send
your equipment annually for servicing by the Mamiya
distributor in your country