"I was having a misfire in my 2002 Hyundai Elantra. Oil was seeping into the spark plug wells. My engine had been running rough, as well, and the misfire kept getting worse. Went to the auto parts shop and they flat out recommended Lucas Oil Stabilizer to fix all the problems. After adding the appropriate 20-25% ratio, the car IMMEDIATELY stopped misfiring and it got better power in the low end, something I had missed for a while. The car runs smoother and is even quieter now! What an amazing product. You guys really live up to the slogan 'It works!' " -Joe DeChristina