Dan Luke wrote:
The oil in my Lyc. O-360 F1A6 is black only two hours after being changed.

What could be causing this? Compressions were in the 70s at annual in
September.

Have you changed the TYPE of oil, by any chance? Going from a mineral
based AD oil (like Phillips XC) to a semisynthetic (like Exxon Elite or
Aeroshell), can flush out deposits that have been accumulating for a
long, long time. If so, things will improve with further oil changes,
but you may want to change the oil and filter again soon.

Rip