I have a 1989 5.5L M117 and a 1976 OM616 sitting in my shop and I decided to look in the valve covers tonight and what did I see?

Rust!

on the M117 I saw it on the top of a cam lobe and the OM616 I saw it on the part of the cam between the lobes

is this normal?

what should I be doing to deal with this?

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1992 850i 6 speed
1991 M3 S54B32 swap
2007 328iT/6 RWD sport wagon
1987 325E 330iZHP engine swap
2004 Vespa 200GT
1976 W115 240D getting a much bigger engine. 5.5L
1997 R129 SL600 5AT