Just changed my oil - wonderful experience. Added my first bottle of pink CD2. One thing ya'll might want to keep in mind if you're stocking up - some of the additive has settled to the bottom of the bottle. What I did was pour the additive in the motor, then poured a few ounces of oil into the bottle and did the "shake, shake, shake." (It was more like "wave, wave, wave" - back and forth). Took about twenty minutes but it all mixed up with the oil and went into the motor. Next time I think I'll use a little MMO in the bottle.