My 2008 Jetta SE, 2.5L, seems to be burning quite some oil — engine looks clean, and there are no spots on the ground, but I've already added a few extra litres of factory-recommended synthetic 5W-40 (I'm not changing oil overly frequently, hence several litres of top-up).
The purpose of the oil is to clean the engine, and suspend particles, where the smaller particles are suspended within the oil itself, and larger ones are filtered out by the oil filter, per my understanding.
When the oil disappears from the engine, requiring a top-up, what happens to those smaller particles that were previously suspended in said oil? Do they burn-off, too? Or are they left behind to be suspended in the leftover oil?