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Thanks for all the input thus far. A few follow up points...
I've been running Castrol GTX 20-50 for as long as i've had the car.
Spark plugs were replaced at service, same cap and rotor. o2 sensor connected. Oil level is correct, still right in the middle.
I went back and took another look at the mileage, looks like I've done 3k miles not 2200 so the 3 quarts should be more in line.
The valves don't sound any different from what I can tell. The car sounds like a smooth running sewing machine and I can only hear the valves when outside the back end.
I just took it out and got it up to temp and then removed the oil cap, no noticeable drop in idle. It sits right at 800rpm throughout so I guess that means vacuum leak.
I think from here I'm going to take it to another wrench I know is top notch and get his assessment. I'll report back when I have some news to close the loop.
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