Quote:
Originally Posted by TrackRat
High revs and engine braking does NOT help seat the piston rings, it sucks oil out of the crankcase and into the combustion chamber which is not good for the engine.
Piston rings function on cylinder pressure, not the lack of pressure. By varying the throttle you vary the cylinder pressure which flexes the piston rings and causes them to seat in well to the cylinder. Without cylinder pressure the only seal of the rings is from radial tension. The minimal radial tension and minimal line contact of a new piston ring is why engine braking on a new engine can not prevent oil from being sicked up into the cylinder. Don't do this as it can cause detonation and does nothing good for the engine.
Just drive normal as the car maker suggest without babying or beating your new engine and you'll be just fine.
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Sorry, but don't agree. Coasting and engine breaking is a part of normal driving, by not doing this you are babying the engine. Secondly, It's not just about engine, you need to break in the transmission as well, and this is where engine breaking is more critical.