Hi all,
Contributing late to this thread. I'm running AMSOIL SSO 0w30 in my 06 Civic SI; now in for over 4k miles and planning on running it another 10k (K&N Panel filter and EaO oil filter).
I've run Mobil One 5w30 extended maintenance, PP 5w30, Royal Purple 5w30, Supertech 5w30, and AMSOIL Series 2000 0w30...
This engine starts the same at 10 degrees fahrenheit as it does at 40...it starts BETTER this winter than the past winter, and the stock battery is a year older.
Engine feels great, returns some of the best fuel economy I've seen (though my driving habits have changed since I switched to AMSOIL)....
But the characteristic I'm truly loving is resistance to burn-off. Previously, all oils were consumed at a rate of 1 quart every 1200-2500 miles (or as much as 1 quart every thousand). The Series 2000 only required 2 quarts in 9500 miles that I ran it. The SSO is still reading almost completely topped off after thousands of miles...I'd guess I'd need about 1 quart every 5000 miles, but it might even be higher.
Further, both the Series 2000 and SSO do not darken much. I don't know what that means, to be honest, but the Series 2000 at 9500 miles was a amber color and the SSO at 4k looks only slighter darker than it did going in (just enough darker to make it easy to read on the dipstick).
My one UOA, at 9500 miles on the series 2000, showed wear to be consistent with UOAs of the same engine after 5300 miles.
I think it's a wonderful oil.
That being said, my wife and I intend to get a Subaru Legacy GT 5-speed for her next vehicle. They pretty much require shorter intervals (there's enough going on with them and proper lubrication that I wouldn't stretch it beyond 7k). For that, I feel like GC 0w30 would be a good application (the almost 40 weight characteristics may be good for the turbo engine), or Pennzoil Platinum, or Rotella 5w40 synthetic.
As much as many poo-poo the idea that a different oil results in a different engine feel, I completely disagree. My Civic SI ran like rawer on the Royal Purple...much more raw feeling when it revved, more vibration.
My wife's 03 Saturn Ion ran smoother tha it's ever been when I switched in Rotella 5w40...I feel like the heavier weight helped damp down the engine.
Just figured I'd share
Joe