The Smålänninga had climbed to seventh place, with Leksand close behind, and have had it easy for Leksand this season with two straight victories.
And tonight they continued in the same vein.
- I think we have a good start.
We need to get a little more time in their zone, says Oskarshamn's Emil Martinsen Lilleberg to C More after the first period.
After a goalless first period, Oskarshamn opened the scoring through Antti Suomela after a lightning-quick conversion.
An invitation by Leksand gives Suomela free space in the second period, which makes him score 34 goals.
But the reply came quickly.
In-form Kalle Östman, who has been extremely scoring for his team, equalized 1-1 for Leksand.
In the power play, Oskarshamn's Patrik Karlkvist made it 2-1, scoring his 23rd goal.
An efficient Oskarshamn increased to 3-1 in the third period through Myles Powell after a fine solo performance, and barely three minutes later they added through Hynek Zohorna after an invitation.
Also 5-1 came through the Finn Ahti Oksanen on a penalty which was the final score in the match.
- We fight together.
I think today we face a good team.
It's incredibly even, the numbers pull away here at the end.
We have the edge and the confidence, says Oskarshamn's coach Martin Filander to C More.
On Thursday, Oskarshamn meets tenth-placed Linköping in the next match.