I’ve recently come across a few cars, both hydraulic and traction, where the the front, back, or both ends of the motor have multiple zerk fittings, but no drain plugs. Most of the fittings I’ve seen are painted over (from the manufacturer), are not new jobs, and don’t appear to ever have been greased. I’m wondering if I do try to grease these fittings, if I would be at risk of blowing a seal since there’s no way of relieving pressure. Is this safe to grease without removing one of the zerk fittings? Are these fittings not intended to be used?