Quote Originally Posted by mbeige View Post
Or you can take it on a sustained high speed run to clean up the carbon deposits in the exhaust. It's also much healthier for the car, because the oil will be hot and circulating, protecting the engine bits, and plus, you're not stressing it on stop-and-go heavy traffic situations.
When you say sustained high speed, at what RPM should the engine be run at? for how long?

TIA.