The German Bundesliga outfit brushed aside U-Mobitelco over two legs in the EuroChallenge Qualifying Round 1 in October and last week, they hammered Borac Nektar (Banja Luka) in the first leg of their Qualifying Round 2 tie.
Borac Nektar will need a minor miracle in Bosnia and Herzegovina on Tuesday to come back from the 76-46 demolition they suffered in Oldenburg.
Looking back at the triumph, Oldenburg's Jason Gardner says his team was a convincing winner because of the club's interior play and fast start when they opened up a 23-8 lead.
"Our big men had a great day in rebounding and on defense," he said. "Banja Luka missed their shots at the beginning and we hit ours. That made the difference.
"In Banja Luka," he predicted, "we will play against a better team."
Oldenburg coach Predrag Krunic has been in this situation before.
He steered his team to a convincing 86-60 first-leg win at U-Mobitelco but managed to keep his players focused on the second leg which was far more competitive. The Germans won that one was as well, 77-72.
He will be keen to keep his players' feet on the ground, although he must surely sense the team has all but guaranteed itself a place in the EuroChallenge Regular Season.
"We have a nice run at the moment," he said, "and want to take the games step by step."
Oldenburg are also flying high in Germany's Bundesliga with six wins from eight games. They are second to Alba Berlin (6-1).