This is one for the archives. I know most of you guys know this.
The first is the most desirable (moving left to right in the pic)
It's a housing from a 1990 DSM and earlier Japanese engines that has M16*1.5 outlets for an oil cooler that transfers heat via air.
The next (and center) is from a god-knows-what non turbo or Mighty Max and has no outlets for anything, no water-oil- heat exchange.. nada but you can buy it for 60 bucks from some shops for some reason.
The last is the old water-oil heat exchanger type. The advantages are in the quick warmup of the oil for a daily driver as well as the cooling properties of good thermal conductivity. The problem is that the lines leak and burst and the exchange becomes literal as the water seeps into the oil system and vice versa, the filter backs off the housing, leaks, falls off.. you name it.
So there you have it. You can get the good housing at the dealer but the lines are 190 or so (I don't recommend used lines) We can make lines from braided stainless and aluminum Aeroquip components for $220. Money well spent.
All the gaskets to the oil housing are the same. You have to pull a bunch of stuff off the engine to get the housing off, like the pulleys and timing belt cover which means the motor mount has to come off as well. It's not a quick job but it's worthwhile. You will also have to block the heater pipe outlet that runs behind the turbo down to the filter housing as it will remain unused.
That's all for now. Someone will find this someday doing a search I hope.