All operational Bf 109s during WWII used the DB 601/605 series engines.
Nope. 109Ds were used in the assault on Poland in Sept 1939. 109Ds were used in the Battles of Low Counties and France.
I recall reading that the later Bf 109Ds actually used the Db 601 engine. I will try to find that reference and post it. Whether they were exclusively the "D"s used in Poland, I can't say for sure. I do Know that not many "D"s were used there, and they were quickly replaced by "E"s.
At any rate, whether or not the "D"s used a DB 601 in no way changes what I said about the Bf 109 using the same basic engine throughout WWII. The DB 600/601/ 605 series were basically the same engine as it went through development. To quote Wikipedia:
"The DB 601 was basically an improved DB 600 with direct fuel injection."
The DB 605 was, in turn, an improved DB 601. If a few Jumo-powered '109Ds got into the early (the very early) battles of the war, they had very little impact, relatively speaking, and, again, my comments of 9/25/08 stand materially unaffected by that circumstance.