Pl/SQl this works - Toad it doesn't

I’m a new user to Toad and want to use some of the better features that PL/SQL doesn’t give me.

I have Pl/SQL code that executes in Pl?sql developer -But when I open in Toad it throws all kind of errors (ORA-00907).
It’s becuase it’s converting || statements to CONCAT satements and inserting all kinds of parenthesis ( into the code.

I’m on Oracle 10g

Is there a setting in Toad so it doesn’t do any conversion ?

Thanks in advance