A relevant post from a thread about catch cans early last year.
Quote:
Originally Posted by D.O.G.
When I was driving "BoB" as my daily, I fitted a catch can (home made) because of the amount of oil coming through the PCV.
I later fitted a basic water injection system (also home made) to clean carbon from the combustion chamber and rings.
It restored some of the power and fuel economy the engine had lost over the years (over a few weeks), it also stopped the engine dumping so much oil out the PCV.
I'd been draining 15 to 20 CCs from the catch can every couple of weeks. After the rings had freed up (I guess), I only got a few drops out of the catch can.
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Cleaning out carbon (that may be causing your rings to stick) won't restore compression in every case, but it's cheap, it's easy and it worked for "BoB" (now retired).