slipstream444

I believe the M1 as at least partly to blame for the higher oil consumption rate you're seeing.
I used M1 in one of my previous cars ('95 Civic) and it used about 0.4-0.6 QT in about 2000 miles. That rate went down by about 0.1-0.2 QT when I switched to Castol Syntech in that car (at around 75,000 miles).
Unfortunately, the S2000 uses more oil than most other late model Hondas, and this may be the compounding factor.
M1 is a good oil, but consistently has shown to be more volatile than many of the other synthetics available. While this tendency has gone down as M1's formulation has improved over the years, it still performs at barely an average level on the NOAC volatility tests. If you can't switch to Amsoil or Redline, you may want to try the Delvac that's been recommended by Road Rage. I believe the Delvac line is less volatile and may reduce your consumption rate. He also mentioned the new Motorcraft oil is a good choice as well.

As I mentioned in a previous post, my consumption rates are typically not noticable (~0.1 QT) in a 2500-3000 mile change interval in my S2000. I've run Amsoil 5W30 in the winter and Euro formula 5W40 in the summer and my consumption rates have remained steady and predictable. For note: my car sees a lot of Vtec.

Yellowbird

I am due to change my oil (7500 miles) and plan to use the new Mobil 1 Racing Oil 0-30W. Figure that should be good for the high RPMs.

Also got personalized tags here in Florida "[B]ZZOMM

xviper

I'm really sorry. I did a typo. Really meant to say "This is not UNusual for this car" to have this sort of oil comsumption.
Some owners have reported usage as high as 1qt every 800 to 1000 miles in the early stages of the car's life, while others report zero consumption. Most cars will use significant oil till long after 10,000 miles, then taper off gradually till it's barely noticeable between oil changes. Then there are those who have a period of zero consumption and then for no reason, the oil starts to disappear again.
I am at a loss to provide you with a solid explanation as to where this oil goes. I think most of it gets burned but unless you are going through it faster than about 1 qt. every 500 miles, you'll be hard pressed to see any visual indications (like smoke) of it happening.

Bigsalgt

Thanks Xviper, you just had me on the floor crying, no honestly its only noticeable when Im on it alot and thats not often. It still amazes me though on where it goes! Im almost convinced that it just gets burned off at that high of compression and redline, alot different then a car that burns oil because the internals are worn or abused! I will try another brand to see the difference in this, thanks for your advice guys!

slipstream444

Xviper, do you believe the cylinder liner design is partly to blame?

slipstream444

Just for note: my car just went over the 18,000 mile mark last week and so far the oil consuption has been extremely low and consistent. The only exception was after I switched to 5W40 and my car used just at 0.4 qts in 2,747 miles (just checked my records). Since then, it's been right around 0.1 qts per 2,500 miles.

xviper

I wouldn't use the term "blame". I prefer to use the term "cause". I'm going to be a bit non-committal (for a change ) and simply say that oil usage in this motor is caused by all of its characteristics, including the liners. I think it's a combination of everything - liners, rings, high rev limit, compression, head design, oil pressure, VTEC system. And the reason why there are variations in the way these cars consume oil may be due to this combination being just slightly different from one engine to another. Our motors are very complicated devices and it would be unreasonable to attribute oil consumption to just one thing. Additionally, where such consumption would be considered BAD for another type of engine, it may very well be "normal" for ours (within limits).

slipstream444

Well put Xviper.

Bigsalgt

Thanks Xviper!