I’ve just recently changed my oil and for the last three changes, I’ve been low on oil. The amount is about 1-2 quarts low. As a result, I’ve been researching the purpose. I’ve read somewhere that an old, unmaintained PCV valve can be the reason. Also, more recently, I stumbled upon this article:
Now I don’t know how reliable this is because it makes some interesting, sometimes far-reaching claims. There is a section that suggests that the catalytic converters will break down as a result of using subpar gasoline. Compression is reduced and excessive fuel and oil consumption ensues.
This post is for anyone who has encountered this problem with success or anyone who has installed upper high flow cats. Note, this does not apply to the lower cats.