Install an
oil thermostat with a one way check valve on the return. From what I've read
Oil coolers can fail due to high
oil presures on startup with cold oil.
I've set up an oil thermostat that doesn't allow oil to run through the cooler till it's up to temp. There's also a non return valve on the feed from the cooler back to the motor. This stops the high pressure from hitting the cooler coming back the other way from the motor.
This was reccomended in the instructions that came with the oil thermostat from Earls. The thermostat is a billet alloy block about 4" square and 1" thick with 4 connections.
Cheers