Oil Catch Can are useless

The OCC is only useless if the owner is useless too by not emptying it when necessary.

 

Which is the way all of these engines run until they start burning oil. Mine was steady through 125k miles. The subsequent blowby creates more pcv flow and the burned oil dumps more hydrocarbons into the exhaust.

Some say Atkinson cycle is a factor in a port injected engine but it has not proved to be an issue on Gen4s used throughout the Toyota line.

 

Our '10 will likely never get there; it's currently at 102K kilometers, and we're putting on around 3k kms per year. All my prep is cargo cult.

 

The definitive look at gen3 Prius and Lexus head gasket cause, effect and how to fix it right.

This video is a year old but its analysis has aged well. It includes a discussion of oil in the intake.

HG Fail Multifactorial Analysis
Car Care Nut

Spoiler Alert - It’s way more than a cleaned egr system and head gasket swap.