Couldn't find much info on this or precedent s for case study.maybe it's unnecessary?but i like the idea of preventive maintenance. Plus it's not that expensive. What's the thought on this fellow briskodarian?

Do you have an auto?  If so, doesn't it already have a transmission cooler built into the radiator?

Yes a 5 spd tip.with the engine,turbo and gearbox,it seems to me that the stock cooling system would have to handle too much.ill keep the stock cooling with additional oil cooler for insurance.its a very hot country reaching almost 40°c on midday plus the lazy slushbox that slips way too much doesn't help either

Not many people here see above 25'C on a regular basis... Might be best to check out some of the US Passat sites.

Oh that make sense.After much thinking,im going to give it a go ahead.hope nothing leaks after that

Make sure you install one with a thermostat. There is nothing worse for an engine or transmission than never getting up to design operating temperature, and you may think 40C air temperature is hot, but lubricating oils are designed to run at 100 to 130C.

The tiptronic box has a oooler.

Best advice is change the oil and the filter every 50-60 thousand km, if you think it is running hot.