From a bit of Internet searching, it appears to me that both the Echo and the Yaris share the same 1.5L 4-cylinder engine (2NZ-FE).
As far as oil recommendations, I'd suggest sticking to what the manufacturer recommends (likely to be either 5W-30 or 5W-20). Sticking to less than 5,000 mile intervals (what is the manufacturer recommended OCI?), I'd likely run a conventional oil such as Havoline, Pennzoil, Castrol GTX, Motorcraft, or Trop-Artic.
As far as oil recommendations, I'd suggest sticking to what the manufacturer recommends (likely to be either 5W-30 or 5W-20). Sticking to less than 5,000 mile intervals (what is the manufacturer recommended OCI?), I'd likely run a conventional oil such as Havoline, Pennzoil, Castrol GTX, Motorcraft, or Trop-Artic.