Description Mobil Delvac 1™ 5W-30 Advanced Synthetic is an advanced full synthetic heavy duty diesel engine oil for long and reliable service. The development of this product summarizes almost 100 years of research and development knowledge. The goal was to define a product that addresses all features required for modern on-highway truck applications, including those with emission control systems¹. This premium performance product offers unsurpassed oxidation stability², which results in engine cleanliness promoting efficient and smooth engine operation. The robustness of Mobil Delvac 1™ 5W-30 Advanced Synthetic meets or exceeds the longest oil drain intervals defined by major global manufacturers, offering protection during extended oil drains up to 3X the OEM recommended intervals¹. It was also developed and tested to protect engines that use biofuel to consider different diesel fuel qualities and future, sustainability related fuel components. The advanced lubricant formulation is designed to help gain fuel economy benefits in modern engine applications³. The outstanding wear protection performance of Mobil Delvac 1  5W-30 Advanced Synthetic is the result of extensive and close cooperative development work with major equipment builders. As a result, this product meets or exceeds the requirements of the latest API and ACEA industry specifications for diesel engine oils, as well as the requirements of many major American and European engine manufacturers