Full Synthetic Formula: Polaris Diesel HD 5W-40 Full Synthetic Engine Oil uses an excellent powersports-grade full synthetic base oil to deliver the highest level of performance and engine protection. Engineering approved for Polaris diesel engines. Ultimate Performance: Diesel HD 5W-40 Full Synthetic Oil delivers extreme cold weather start-up protection, maintains its viscosity in severe temperature applications, and features outstanding thermal and oxidation stability. Applications: Compatible with the following Polaris models: RANGER Diesel (2011-2013, 2015-2018, 2020-2021), RANGER CREW Diesel (2013, 2016, 2017-2018), RANGER Diesel HST (2014, 2016) and RANGER Diesel HST Deluxe (2014, 2016). Extensive Testing: Thousands of hours of testing every fluid in every engine design ensures you are getting a product that delivers unmatched performance to keep you on the trails with your engine running strong. Engineered to Maximize the Life of Your Ride: All Polaris fluids are specially developed and engineering tested and approved to handle the varied conditions and high-performance requirements demanded by Polaris riders. Polaris Diesel HD 5W-40 Full Synthetic Engine Oil is engineering approved for Polaris diesel engines. This oil provides extreme cold weather start-up protection, maintains its viscosity in severe temperature applications, and features outstanding thermal and oxidation stability. Top reliability and performance are the most important factors in Polaris Engineered Lubricants. Polaris Engineered Lubricants provide the best protection and best performance in all conditions proven through millions of miles of field testing. The latest engine technologies need to be matched with the latest lubricant technology. Only Polaris Lubricants are engineered right along side the machines to ensure they are the best products you can get for Polaris off-road vehicles.