Razrbak80

Was in energy industry for years, and have friends and family still in it. One in particular has more certifications in lubrication products than you can count, and he was there when Mobil first brought Mobil1 to market. The proving of initial product offering was extensive, and billions of miles later in actual customer application shows the long term benefits of full synthetic oil products on engine life for gasoline and diesel engines (Delvac1 for diesel). You can not go wrong with these products, and should follow the OEM suggestions as to 5W30. Our family and business runs vehicles over 200,000 miles for gasoline engines and over 400,000 miles for diesel engines and have never had an oil related issue in over 20 years.