I have not seen very many reviews of this oil on this website and figured I would post my impressions after doing an oil change. I have driven the car since it had 158K miles on it a few years ago, and have fed it a diet of Castrol and Mobil 1 ranging from 5W-40 to 0W-40. For any of you that have experience with Volvos, the inline 5 cylinder is not the most smooth engine. I recently found the Lubro Moly Anti-Friction Engine Treatment with MOS2 which I added to my 1993 Buick LeSabre. The improvement was very noticeable and almost immediate. After this I decided to try the LM 10W-40 with MOS2 included. I changed the oil from Mobil 1 0W-40 to this today! Smoother idle, better revving, less groaning from the engine. I would highly recommend this oil; it is the only oil I have ever tried that made my car drive better! So if you drive a high mileage Volvo, this oil might work for you!