I oil down thw walls by hand. and do the same thing with the rings ( squirt some on with a squirt type oil can ). I don't submerge the pistons in oil. Position the rings where I want them on the pistons and slide them in the holes. I only use tapered ring compressors as I have damaged rings in the past using squeeze type compressers. I use a good grade of 10W40 oil as brakw-in oil.