because of the way the oil system is design. The lines are 3/8 on the TT. But the flow is much less than that because of the restrictor place on the return line to the oil pan. The size of the hole is about 1 mm. How much oil flow do you think you can get with 1mm? If I remove this restrictor , I am afraid of starving the engine for oil because there might be a big pressure drop. I don't know why Nissan design it like this
Mike
Follow Ups
It seem like the oil cooler upgrade is worthless on TT - MikeH(Phoenix)19:54:26 10/07/00