Royal Purple is my love. Used it for 15 years with no issues. I currently use it in my 2014 C300 4matic. I use 6 quarts of 5W-30 and 1 quart of 0W-40. The car loves this oil. It cleans the internals of an engine like crazy. With this oil, I highly recommend you push the engine routinely. The more you push the engine with this oil, the cleaner the inside of the engine gets, the better your gas mileage, and the better the protection the oil provides. If you want to baby your car, this oil is an overkill.If you drive like a criminal, this is your oil. I used to change my oil every 2,000 miles because I redlined the engine routinely, and i did so with confidence from Royal Purple. I used this oil in an engine that was driven hard for 200,000 miles and nothing broke. On the day the engine was opened, the cross hatches in the cylinder on the day the cylinder was bored and honed, was still visible. The engines internals were so clean, it was unreal.