Yes many OM-1's need service. The OM system is not as robust over time as many of its competitors such as Nikon. The OM lenses acquire haze very easily too. The meters on most vintage SLR's need servicing, at least a re-calibration to use non mercury batteries in most cases. I've never had a Nikkormat that failed mechanically at least, but I'm sure they exist.
Originally Posted by Dali