was slightly lower than the aft end, possibly trapped air, but wouldn't

oil pressure force it out?

--
Perry Mick

Perry, The situation with the oil coolers was having the inlet and 
outlet on the bottom. It was possible to trap air. The easy
solution of course was to plumb the cooler with both inlets 
on the top. This also prevented the loss of prime. reguardless of
the type of cooler, plumbing it with the outlet at or near the 
high point prevents a trapped volume.  This wasn't a big problem
with BMW's. The biggest problem was the Kawasaki 900 Z1 they only 
ran 3-6 (that's right THREE to SIX) PSI at idle. The engine
ran a roller bearing crank and ran high flow but low pressure. 
When people would put a aftermarket oil pressure gage on them
they would freak out! Most of the auto gages didn't even start 
to read until around 15 psi they wouldn't even register when the
engine was warmed up! At the flows and pressures used on the Mazda 
you won't have any problem. Bill Jepson

 
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