A
high
powered
modified
engine
tends
to
generate
excessive
blow-by
oil
and
gasses.
In
these
cases,
an
ordinary
small
catch
can
may
quickly
fill
with
oil
and
not
be
adequate.
Like
the
Radium
Engineering
Catch
Cans,
the
AOS-R
(Air
Oil
Separator,
Return)
is
responsible
for
keeping
blow-by
oil
and
other
pollutants
out
of
the
air
intake,
intercooler,
manifold,
etc.
The
main
difference
is
that
an
AOS-R
system
returns
oil
back
into
the
pan
above
the
oil
level.
This
permits
a
service-free
system.
