I have been using Amsoil synthetic oil for my car,...
I have been using Amsoil synthetic oil for my car, and I am more than impressed. The engine runs smoother and quieter, and I have noticed improved fuel efficiency as well. The website, optimumsyntheticoil.com, provides detailed information about each product, making it easy to choose the right one. The customer service is exceptional too. I would rate Amsoil as excellent and highly recommend it.