Dear Paul,
     Here are pictures of different type of oil pan.

Thanks,
Ed Klepeis

Nice looking pan Ed. It needs fins on the inside too.

Paul Lamar

This is the extrusion heat sink you should use in the future.
I think the pics are Perry's Micks oil pan.

http://www.aavidthermalloy.com/

Paul Lamar

Wow, the weight of that extrusion(9.9 lbs per foot) sure caught my eye.
Seems we'd be adding about 8-10 lbs for the fins inside the pan.
I see these fins are over are over 2" high overall.  That's higher than I
would have put in based strictly on "TLAR."  Is there a good rule of thunb
for the ratio of the inside fins (in oil) to the outside fins (in cooling
air)?  I would have guessed, based on the lower density of air and the
relatively higher ability of oil to transfer heat to nearby oil, that max
heat transfer/lb of heat sink would require larger fins in the air with
shorter ones in the oil.

Mark Waldron

These types of oil-pan/heat-exchangers are horribly inefficient
from a weight verses heat transfer point of view. People just
like the looks of them so they keep building them:)
Mostly cosmetic.