This is my first post although I've been reading posts on this site for more than a year in looking for the "best" oil for my 2004 Accord 2.4L. I switched to Amsoil XL 5w/20 when my car reached 20k after read some good reports on this oil. Recently, it hits 47.5k miles and I decided to do my first UOA using sample from the last oil change. The numbers seem good, well, according to folks from Blackstone since I'm no expert on these numbers. Here is the report EQUIPMENT MAKE: Honda EQUIPMENT MODEL: 2.4L 4-cyl FUEL TYPE: Gasoline (Unleaded) OIL USE INTERVAL: 10,370 Miles OIL TYPE & GRADE: Amsoil XL-7500 5W/20 MAKE-UP OIL ADDED: None ADDITIONAL INFO: COMMENTS: Nothing too unusual showed up in the initial sample from this engine. All wear read at or close to averages for this type of engine, which is excellent considering this oil was run longer than averages and a very good indication of normal wearing parts. Universal averages show normal wear after ~6,200 miles on the oil. The low viscosity wasn't due to any fuel dilution and isn't really a concern. The low insolubles show good oil filtration. It sounds like the operating conditions are perfect for this engine and we think the oil could go longer. Try 12,000 miles next time. MI/HR ON OIL 10,370 MI/HR ON UNIT 40,065 SAMPLE DATE 06/21/06 Test Unit/Avg ALUMINUM 4/3 CHROMIUM 1/1 IRON 6/8 COPPER 1/3 LEAD 0/1 TIN 3/1 MOLYBDENUM 36/86 NICKEL 1/0 MANGANESE 1/2 SILVER 0/0 TITANIUM 0/0 POTASSIUM 1/1 BORON 85/65 SILICON 12/11 SODIUM 4/14 CALCIUM 2071/2372 MAGNESIUM 105/67 PHOSPHORUS 711/724 ZINC 852/861 BARIUM 0/0 SUS VISCOSITY 52.1/53-56 @210F FLASHPOINT 385/>355 FUEL% <0.5/<2.0 ANTIFREEZE% 0.0/0 WATER% 0.0/<0.1 INSOLUBLES% 0.2/<0.6 Although they said I could go for 12k miles next time but I'd like to stick with 10K OCI. BTW, out of these number, my BARON and MAGNESIUM number are higher than average. What are they? Thanks!