I remember reading on this forum that the oil cooler is 'crap' and that it was unnecessary for the d24t or even risky to have. I am always tempted to remove then never reinstall the factory d24t oil cooler from my td car but decided to keep (risking) it. Luckily the car never had oil issues.
Second thought came when I refurbed another d24t motor... but, again, I decided to keep that engine 'stock' ... now I am very curious what the experts' answers will be to your question.
Until then, as a warm-up, a good previous discussion on our d24t oil coolers is found here:
https://d24t.com/showthread.php?t=14...cooler+adapter
Your d24t in that Pinz is considered a hard working engine due to the vehicle's weight and gearing, also the elevation you need to deal with where you live.
Once built, share pictures