I am driving an '02 Subaru Impreza WRX and recently changed my oil from the OE Dino to M1 SS 10W-30. The change came at 2600 miles. I put in the recommended volume and checked it and went on my way, no problem. I made a few long distance trips in the car. I have also been driving it a little harder lately around town. Saturday, I pulled into gas up with 3,989 miles on the odometer. I checked the oil and there was only 3/16 to 1/4 inch showing on the dipstick. Hey! What's that about I thought. No big deal. Perhaps I was a little early in pulling the dipstick. I waited for the oil to drain back into the pan, checked it again and still the same reading. Now I am getting concerned. I thought, where did all that oil go? I waited a little longer, checked it, and the same thing, 1/4 inch, maybe. Now I am freakin' out. I buy a $5.49 (cough) quart of the M1 SS from the gas station and make my way over to the Subaru dealership. Well, I spoke with a mechanic that my salesman hooked me up with and he explained to me that in Subarus the dipstick reads empty when the oil volume drops below 3 quarts. This was confirmed when we pulled the dipstick and found the car to be almost full by me putting in that one quart earlier. Just below the line on the stick as a matter of fact. O.K. I have a few questions. Has anybody heard of this before? I can understand why Subaru gives such a tight tolerance on there sticks, but it seems odd to me. I am new to Subaru however. Also, where and how did I lose that quart. I mean it was only 1400 miles. Is that common, uncommon what? The WRX is a turbo charged motor and it has been hot here in Texas and, it has been driven somewhat hard. But hey, a quart +? Is there cause for alarm? Should I be concerned or is this normal. It doesn't seem normal to me. Help!