I've put an entire can in before an oil change and it did seem to flush the engine fairly well - I wouldn't worry too much about loosening too much stuff unless your engine is actually sludged (as was the case in my 540i that I used it in).
If you add it into your intake manifold, be careful not to use too much and hydrolock your engine. One point of caution - when you add it into your intake mani, it'll bust out a lot of smoke - enough that it'll almost look like your car might be on fire, so be prepared for irate neighbors as huge billowing clouds of white smoke start coming from your car.
It does a good job with injectors from what I've seen as well - I'd use it again. Another thing about adding it to the oil - make sure you don't drive it aggressively after adding it to your oil, it acts as a solvent and will thin your oil a bit - so it may not be lubricated as well at higher rpms.
If you add it into your intake manifold, be careful not to use too much and hydrolock your engine. One point of caution - when you add it into your intake mani, it'll bust out a lot of smoke - enough that it'll almost look like your car might be on fire, so be prepared for irate neighbors as huge billowing clouds of white smoke start coming from your car.
It does a good job with injectors from what I've seen as well - I'd use it again. Another thing about adding it to the oil - make sure you don't drive it aggressively after adding it to your oil, it acts as a solvent and will thin your oil a bit - so it may not be lubricated as well at higher rpms.
