Well guys I have been lurking about this forum for a few years. I have a 2.0L MX5 that is about 2 years old. I changed out the factory oil at 1300km with Mobil 1 10w-30, then again at 5000km with Mobil 1. I change my oil out every 5000km. At approx 20,000km I changed to Royal Purple 10w-40. Now at 35,000 odd km I have changed to Motul 5w-30. I am very impressed with this oil. I thought the Mobil and Royal Purple were supposed to be good and I think they are ok but this Motul is different. The car seems to be able to rev quicker, quieter and starts up better. With both the Mobil and Royal Purple, there were tenths of a second where I thought there was little/no oil lubricating the internals. With Motul it appears that there is a film left behind on the internals which prevents metal to metal contact. I think I'll be sticking to this brand now. I urge some of you guys to give it a go. BTW apparently it has zero shear loss too.