Why not? You don't even need to take it to high speed, simply
run the RPM's up in a lower gear for a while.



mike hunt



Andy & Carol wrote:
>
> I have a 98 Accord with a 4 cyl, and the car is driven in city streets.
> Is it still ok to take it out on the highway and run it hard, like we did
> the old v8's, to blow out the carbon. This is my first 4 cyl and I wonder
> whether it was still
> necessary to do that?
>
> Thanks,
> Andy