i thought you might be interested since i posted this thread i have done some research on fitting a craig/ davis oil cooler. firstly for 100% efficent it is recommended after market cooler go in front of factory cooler. secondly the additional cooler must be placed downstream to minimise oil temperatures. to identify which oil line flows into and out of your factory cooler a simple method to check is start the engine cold. place transmission shift lever in drive for no more than 10 seconds. stop the engine. identify oil return line by feeling both oil lines. coolest line is the return line back to transmission. ( eg.for my zd30 the top hose on factory cooler was the return line). once flow is determined its a matter of fitting after market cooler in-series. simple terms, piggy back both coolers together. cooler cost $139 at super cheap and took around 3 hours to fit. hope this helps any one else doing this mod.
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