I'm afraid I do not subscribe to the theory that because it is fully synthetic it must be better. It has better marketing and commands a far higher price! I am being slightly flippant, but to the ordinary car driver who has his car serviced once a year and does the average mileage, I do not see the benefits. There are vehicles that will benefit from a fully synthetic oil, and if you are a high miler, then I could see why you would, but to the average Joe Egg, GOOD QUALITY 5w 30 semi will be just fine and you will save yourself a few quid in the process However, we live in a world where we have a personal choice, and if you feel the need to go fully synthetic, then go for it ;) Kingo