The change should not have affected system oil pressure as the cooler is on
the scavenge pump circuit, not the pressure pump. That said, it's curious
that you would notice the drop in pressure coincident with the upgrade. Did
you do anything else to the engine/oil system that you can think of?

Signature
Mark Hald
'77 Carrera 3.0
http://members.rennlist.com/hald
> I have changed my oil cooling radiator located in front of the right front
> wheel and since that time i ave noticed that the oilpressure isn't the same
> as it was before. it is in fact 1/2 bar lower at 4000 rpm. there is no
> leaking of oil and enough oil in motor and system. Can this come from the
> upgrading from an old type of oil cooler to a new one, can the oil flow
> better cause of the new cooler resulting in a lower pressure.