When I rebuild cylinders, I thoroughly lube the ring groves and piston skirt with whatever oil I'm going to use in the crankcase. I also squirt a little on the cylinder wall before I install the piston. Before I start the engine, I usually turn it a few times. The oil scraper ring will remove any excess oil. I've rebuilt engines with a 25,000 hour time between overhaul interval, so it's very important that the rings seat properly. One of them smoked some at idle until it was put under load, after about 30 minutes under 50% power, the rings seated and it hasn't smoked since. Sometimes it's hard for us to put engines under load right away.