Okay, we have a new car. Free Maintenance for 2 years / 25k and my manual calls for 0w20 full synthetic oil. Great, but the manual calls for 10k oil changes and nothing about the normal and severe usage. I like changing my oil more frequently then running extended OCI. This seems extreme and Toyota doesn't want to pay for changes every 5k, why offer the maintenance plan then. I might just start changing it every 5k to be on the safe side. I have read UOA and have seen good results but it just seems to good to be true. I might go 7k instead of the 10k or go with 5k changes. Any thoughts!!! Also all my local dealerships use syntec 0w20. I know its a good oil but I haven't seen a UOA running syntec this long other then GC. Thanks!!!