Patent ID: 7073570

Claim:
A heat exchanger comprising an oil cooler section, said oil cooler section comprising: a first manifold and a second manifold in spaced relationship, and a plurality of tubes, each said tube defining an oil flow passage and having a first end connected to said first manifold with said oil flow passage in fluid communication therewith and a second end connected to said second manifold with said oil flow passage in fluid communication therewith, each said tube being formed of tube metal with an inner and outer wall and opposing pairs of fins extending from the inner wall at least pan way into said oil flow passage, said fins being spaced apart by cans and said cans being staggered across the tube wherein each par is offset relative to an adjacent gap, each said tube having a cross-section characterized by a performance ratio between about 3.9 and 8.5, wherein the performance ratio is a ratio of a wetted perimeter in millimeters divided by a cross-sectional area of the tube metal in square millimneters.