First time I read about these microglass filters, was back in 1994/1995. Think it was a Mahle filter. I have also used Amsoil(5/30 series 2000, I think). It said you could go 40000 km on that oil. I had it in for 20000km. I think they have a good oil, but in my opinion it is no better than RP. Did not notice any difference in noice or fuelconsumption. The only oil I have experienced a noticable change in noice and fuelconsumption, is the Synlube. How it performs in the long run is yet to be seen, because I have only done a bit more than 5000 miles on it, now. Have you noticed the similarity in viscosity index with the Eneos? Eneos have 199 and Synlube have 200. Also, Eneos is a 0/50 and Synlube is a 5/50(at their homepage they tell you itis closer to 0, but they sell it as a 5w, since most americans don't buy oil marked 0w.