My girlfriend and I have owned 7 Volvos between us. She bought a 2012 CPO in 2015, while under the CPO warranty, she came over and said the oil light was on. I put 5qts of oil in it that day, I told her to take it back to Smythe Volvo (SummitNJ). They told her it's fine don't bring it back till the oil light comes back on. Down 1 qt over the next 1000 miles. I said bring it back to Smythe. That happened every 1000 miles for the next few months. They said it was normal, I had the same 5 cylinder motor in all the cars and none burned oil. They capitulated after the sixth time of bringing it back and scheduled the rings to be replaced I told them they had to do something before the CPO warranty runs out. We were on vacation and they called to say they wanted 500 bucks to swap out a sensor and upgrade the ECU (computer), I told them NOT A DIME until were satisfied that they fixed the oil issue. Got the car back kept getting battery low even after swapping out the battery with a new one, and it was still using oil, not as bad as it was, but still. I have a 2006 S60 with 150K I drive it back and forth to Florida and it runs like an Imperial Star Cruiser, Not One Issue. We traded the 2012 back in and got a 2016 S60 and it seems to be fine, I have been checking the oil and it seems to be Great! I think they had bad rings from 2012-2015 and Volvo knew it, there was a mention of a class action suit, Not sure if this was a thing, I am hoping the 2016 doesn't start burning oil since it has less than 50K on it now..
Good Luck to everyone in this position, Let me know if I can help.