This how much was drained out of the catch can after 5,000km since last drain on my ASX diesel. Imagine all this trapped in the intercooler and intake piping. I am using one of those catch cans for diesels with a filter as normal catch can i had proved to be not sufficient as fumes with oil would simply make it past it (i could see it when i removed hose after it and it was drenched in oil). Second pic shows the depth of the oil in that little jar.