Sump + Cooler

[deezee]

I've chopped up a sump off a Sierra DOHC to suit my 16V RS 2000 engine. Now cos its aluminium I tried to keep the cut as simple as possible to make the welding back up easier. So effectively I've just taken out 30mm from the sump.

Now my plan was to add back this stolen capacity by fitting an oil cooler, however my buddy tells me this is a daft idea. He believes that that the sump needs its original capacity to avoid starvation? Surely as long as there is plenty of oil in the system, its all that matters?

Could you guys shed some light on this?