Do I have to use synthetic oil?

I drive a 2008 Honda Civic Hybrid. The last two oil changes I've had, I've used synthetic oil. Do I have to keep using synthetic? Can I use a blend or switch to conventional altogether? I've done some research, and I keep finding that I Honda recommends conventional, but is that an issue with the hybrid?

Unless it specifically states in the owners manual that synthetic oil must be used, conventional is just fine

Use the real thing

I dunno

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