My wife drives a 2011 CRV with about 190,000 miles. Has been running great with no issues. Recently it started burning oil- about a quart every 1500-2000 miles. It burned almost no oil between oil changes until a couple of months ago. I know Honda extended the warranty for these cars for stuck piston rings due to carbon buildup. Her mileage is over the warranty. Do you recommend a way to clean the rings without pulling the pistons? An oil additive maybe? Thanks!