http://dsmtuners.com/forums/showthread.php?t=191657&highlight=oil+cooler+2g

Post #24

He has the same oil cooler and adapter I have. Someone mentioned that by keeping the stock oil cooler in place it would decrease the effectiveness of the Greddy cooler, but the adapter requires a shorter bolt thing... I made this picture so that you could visualize the problem. The blue is the greddy adapter, the orange is the filter housing, and the gray is the bolt thing with a hole in it, as you can see there is a gap where the stock oil cooler goes.



Is the greddy cooler really going to be hurt by keeping the stock cooler in place?

Does anyone have a diagram of the complete water system? Where do the water lines connect from the stock cooler?

Well another reason people get rid of the stock oil cooler is because of the possibility with the oil mixing into the coolant. As well as what you mentioned with the efficiency of the aftermarket cooler.

I personally would try to eliminate the stock oil cooler all together.

Use one or the other. The stock unit does a good job of keeping the oil cool. A properly set up external cooler is a better set up. The thermostat on a external will help your oil heat up faster, which is a plus.

Is the thermostat in the oil filter housing or the water exchanger thing itself?

The 90 oil filter housing has a thermostat built into it, for the external cooler. The coolant based oil coolers do not use a thermostat. You are using the engine coolant to cool the oil. So if your cooling system is working properly your oil will never get too cold.

RedTurboEclipse said:

Well another reason people get rid of the stock oil cooler is because of the possibility with the oil mixing into the coolant. As well as what you mentioned with the efficiency of the aftermarket cooler.

I personally would try to eliminate the stock oil cooler all together.

Click to expand...

that's the problem, the center bolt is too long. But I contacted Greddy and they said that keeping the stock oil cooler in place is the right way.