Most states do not allow expungement if you have a conviction. The trend is also to count lifetime offenses should you be convicted agan. You should check with DUI attorney(s) in the state(s) in which you got the convictions.
It may be possible to expunge a DWI charge which was dismissed or resulted in acquittal after your lawyer helped you win it.
If you were convicted under the Minnesota expungement statute (609A), a DWI conviction cannot be expunged.
In my state (Washington) a DUI cannot be expunged from your record, no matter how old. I suspect this is the case in many other states, but you should contact a local attorny to double-check.
A DWI conviction cannot be expunged in Minnesota no matter how long it has been on your record. The only way a DWI incident can be taken off your record is if the case was dismissed. A stay of adjudication for dismissal or stay of imposition for dismissal does not qualify for expungement. If you have more questions contact the DWI GUYS at DWIGUYS.com