Been using Cerma motor oil for about 3 years, the difference in overall performance has been amazing. Power, smoothness, my Volvo runs so smooth even my friends riding with me notice. I started using Cerma motor oil at approx. 120,000 miles and it runs better than it ever has. I’m 79 years old, used a lot of motor oils over the years and nothing has made a difference like Cerma products.