This car has a small sump for a V6 3.3L engine. When you change the oil it only takes a little bit less than 3.5 quarts to fill it up. On this OCI I added about 1/2 a quart about 2,000 miles in to top off. Then after about another 1000 miles I added 4oz of Auto RX. All on a Mobil 1 filter. This is my first Analysis with this engine/car. It is my wife's daily driver. She is about 18 miles from work and it takes her about 25 minutes each way 50/50 highway and stop and go city. This is also the first run on synthetic oil. Previously my wife has only run Dealership Bulk Dino for 3000 mile OCIs. She has been VERY good about regular maintenance. Right now it has 3 quarts of Mobil 1 10w30 and 1/2 qt of Quaker State Torque Power 10w30. Blackstone's comments: DAVID: Universal averages (far-right column) show typical wear metals from this type of engine after approximately 4,300 miles on the oil. Wear metals were low and in a nice balance for the 3.3L, and this shows the engine is sound mechanically, and free of evident problems at parts. Silicon was mildly high, so check the air filter just in case dirt is getting through. The TBN of 1.9 shows some oil additive still active. A <1.0 TBN means oil should be changed. The thin viscosity (possibly from Auto RX) didn't hurt anything. Try 7K miles on the next fill. Nice engine! mi/hr on oil 5000 mi/hr on unit 53,797 Sample Date 3/21/09 make up oil added .5 qt aluminum 3 chromium 1 iron 9 copper 2 lead 6 tin 1 molybend 91 nickel 0 manganes 0 silver 0 titanium 0 potassiu 4 boron 33 silicon 21 sodium 8 calcium 1951 magnesiu 11 phosphor 603 zinc 713 barium 0 sus viscosity @ 210F 57.2 should be 59-68 sus viscosity @ 100C 9.41 should be 9.9-12.7 flashpoint in F 400 >365 fuel percentage <0.5 should be <2.0 antifreeze 0 water 0 insolubles 0.3 should be <0.6 TBN 1.9 Your opinions are Welcome!