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[aaronjb]

there is a very simple answer to all this, an auto gearbox cooler is designed to withstand virtually no pressure (as the return line to the box simply dumps the oil back into the sump)however your engine oil cooler has to withstand pressures which might reach(on a cold winter morning)100 psi. i'm sure you gentlemen can figure out the implications

A very thorough undersealing job and a total-loss oiling system?

[ngrainqey]

Just realised exactly what model you have. Yes, your ATF cooler is oil/air 

The Senator did use a small radiator in/under the front driver's side of the car for the engine oil, as suggested by Chris, it used a 'stat in the feed to it from the plate under the oil filter .............. often didn't work though. 

LOL at andy, i did say so to begin with
anyway yeah, i dont like the earlier gearbox coolers built into the rads but even the external coolers, how cool do they keep the gearbox oil? it'd tend to get quite hot with sustained higher rpm driving e.g high speed pursuits, trackdays, getting quite enthusiastic on a country road in the case of the older gearbox coolers

alex

[Kevin Wood]

there is a very simple answer to all this, an auto gearbox cooler is designed to withstand virtually no pressure (as the return line to the box simply dumps the oil back into the sump)however your engine oil cooler has to withstand pressures which might reach(on a cold winter morning)100 psi. i'm sure you gentlemen can figure out the implications

Yep.. Save a few pennies and destroy the engine when it goes pop on a cold start with thick oil. Get a proper oil cooler which are much more substantial than the transmission cooler, although you'll still be fixing that which isn't broke, IMHO.

[ngrainqey]

im not entirely convinced, i know atleast 1 volvo s60r that even has a PAS cooler although it does regular track days

[Andy B]

im not entirely convinced, i know atleast 1 volvo s60r that even has a PAS cooler although it does regular track days

your Omga has a PAS fluid cooler too ............... it's the plain tube at the front of the rad 

[Marks DTM Calib]

More importantly, there is a question that has to be asked.....

....what causes an oil cooler to fail.

We all know the answer and we all know how to stop it happening