Originally Posted by german_catera_fan
From an engineering perspective, we live in a world of tradeoffs. Years ago rapid oil warmup doubtless enhanced oil lubricity and engine lubrication. This was good. It is what we got in the tradeoff for a heat exchanger which can, at times, become problematic.
That was then and this is now.
Today we live in a world of highly engineered, sophisticated, multigrade oils. These exhibit excellent lubricity over a far wider temperature range than oils of old.
Also, many regions of the USA do not experience seriously cold weather regardless the season.
My personal view::stirpot:
Today use of a heat exchanger carries more downside potential than upside benefit.
I agree with the course taken by other posters here who deep sixed their heat exchanger in favor of an aftermarket oil cooler.
Also for USA Catera owners living in warm or hot regions of our country:
An aftermarket oil cooler, as contrasted with use of the heat exchanger, moves oil heat directly to air. This has the effect of increasing your cooling system capacity. It is akin to fitting a stouter radiator. And it is smart. Here is why:
The Catera can be intolerant of overheating. It has aluminum heads resting atop a cast iron block. These metals have significantly differing coefficients of expansion which can cause trouble out at the edge of the envelope. Especially for owners operating in warmer climates, it is wise to add to your cooling system capacity cushion.
A badly overheated Catera all too often becomes a dead Cat.
JMHO, of course.