Originally Posted by
Sonic Boom
Ideally you should put in what you had it mapped on.
I always use Shell V-Power or V-Power Nitro as it's called now.
Rich
This ^^.
If you go lower octane when it's mapped for higher octane it can cause issues such as pinking etc.
As a general rule, FI and other N/A engines like 'SUL' though.
In the case of a 'run of mill' motor though using 'SUL' wouldn't cause any harm, but you wouldn't gain any benefit.
Martin