There are several synthetic oils out there, and dino as well, that do very well in their nich. Amsoil's biggest benefit is the fact they stand behind them for an extended drain interval using the prober filtration. No one else will sell you a motor oil and tell you its good for 25,000 or even 35,000 miles. I am using the 0W-20 in my 3.3L Sonata, since its the first time with a synthetic I am going to change it out at 7,500 and send out a sample to see how its doing I plan to run at least a 10,000 mile OCI and will step it up to 15,000 as testing shows me its doing its job.