[Burnin21]

I went 10,000km's on my Mobil 1 synthetic, when I dropped the oil out of the car it still looked relativly brand new. The filter was heavy but still worked fine. In my opinion i'd say any where between the 6-10,000 km mark is a decent time to change your synthetic. My car has only seen 5,000kms on conventional oil, so really there aint much point in me switchin back over. Shocking to see how there is no change in the results, but a big change in price.