"Robert11" <rgsros@notme.com> wrote in message
news:6oSdnYruFqoGLtPZRVn-jQ@comcast.com...
> Hello:
>
> Have an Accord, 6 cyl, 2005.
>
> Manual says to use 5W 20 oil, a bit surprisingly.

Why do you believe this is surprising? It's been the recommended oil since
the 2001 Honda products were introduced.

> How critical is this ?

What does the Owners Manual for the vehicle state?

> If I use, due to 5W 20 not being available, e.g., 5W 30, or 10W 30, any
> potential problems ?

What does the Owners Manual state?