David,
The AirWolf remote oil filter system (certified, I think) comes with aluminum
oil line fittings at the engine and the oil filter adaptor.  I know about the
fatigue question of aluminum but are we to think these guys don't know what
they are doing?  (I used steel fittings everywhere else firewall forward and
this is a normally aspirated IO-360).

Ed de Chazal
N361DC