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External cooler removes heat from the oil directly rather than depositing it in the coolant to be removed at the radiator. There is a thermostat somewhere in the 951 system that does not permit oil to flow to the external cooler until it reaches a threshold temperature.
If you are planning to track your car, I would suggest increasing your oil cooling capacity. I do not think the factory oil to air cooler is sufficient for tracking in hot weather. I use two coolers in series. A friend of mine who club races his 951 says a Mazda turbo generation 2 oil cooler can be fitted to the cars without much trouble. I did not go that route but, instead, installed a second one in series with the factory one. No more coolant temperatures creeping up in hot weather and no more oil pressure drop off on hot track days.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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