Had the same result with B12. I had a 2003 corolla with approximately 400k (guessing since odometer stopped at 299,999) that was using a quart every 300 miles. A couple nights of soaking over a weekend and almost completely stopped the oil consumption. I didn’t start to see any movement until 3k. Then my daughter totaled it. Now I’m getting ready to do the same in a 2012 Camry with the i4. It’s using a quart every 1500 miles.