Good Question: Why did Porsche..

[jaykay]

Originally Posted by san rensho

Ok, I'll bite. Porsche has had a problem (that I've heard of, mostly with Caymans) with 987 motors developing cylinder and piston scoring in cylinders 4-6, leading to engine replacements under warranty. Thinking that the problem was oil starvation, Porsche got rid of the swirl pots and just dumped the oil directly into the sump with the straight pipe.

For what its worth, Hartech argues very pursuasively that the problem is not oil starvation, but overheating caused by a revision to the head gaskets which makes them cheaper, but which leads to higher temps in the 4-6 banks, especially cyl 6, which is compounded by the Porsche coolant thermostat that runs at too high a temperature.


http://www.hartech.org/docs/buyers%20guide%20web%20format%20Jan%202012%20part% 205.pdf

Ahh it's all in here!