Quick 2007 Yaris oil change question

[lenzomaru]

I would like to use syntec oil, but as a way to save money as this will extend my oil change time, i currently change my oil at 5000km (dusty roads,day temp avg 31 deg c) with syntec i believe i can go for 10,000 saving me money for oil filters and also time (as i change oil myself) My yaris takes a little under 4 qts of oil

- 4 qt of castrol 10w 30 dino oil is $30 US
- 4 qt castrol 10w 30 full syntec $53 US

Since i'll be doing 2 dino oil changes in the same amount of time (10,000km) i'll have to buy 8 qts dino oil totaling $60 US as compared to $53 US for the full syntec during the same period (10,000) also i will have to purchase and extra oil filter ($20US) and my time to change it.

so the syntec can out for me