MW50 -Secondary effects were cooling of the engine .

[Shardur]

Originally Posted by Whacker

... this: http://kurfurst.org/Engine/Boostclea...arance198.html Scroll down to see the english text where it talks about a P/W source stating the MW50 injection on the G-14 variants was good for 30 min, in 3 10 minute stretches with 3 min in between. If each of the 3 full 10 minute sessions was used in flight, it reduced the engine lifetime by half...

Thanks, I actually overlooked that part. However you misunderstand a small part of it: It does not reduce engine lifetime but flight endurance, which means that the flight range and time of flight is lower due to the increased fuel consumption at hight power settings. (Of cause none of the military engines of WW2 where created with very long lifetimes in mind anyway so, even if not further lowered, engine lifetime wasn't stellar)
Fuel consumption numbers are actually provided on the page and are for instance for the DB-605DB on maximum power settings 610 l/h plus 180 l/h of MW50 fuel (so a total of 790 l/h). High (climb) power for instance, which is the power setting below the boost setting, only uses 470 l/h.