With Oliver riding, Sunsource ($4.20) scored by a neck from Line Of Fire ($8.50), while the $4 favourite Dolphin Skin was a length away third.
"Having Ollie on, 'The Goat' standing over him seemed to work and he hit the line nicely. He's always shown a lot of ability but his last couple of runs he's just switched off a bit. The blinkers on have made him a bit more genuine and it's great to get another win at Flemington."
Sunsource won the Magic Millions Ballarat 2YO Classic (1000m) on debut last November but has not been hitting out in his races this campaign.
The way the son of Zoustar had been racing suggested he was looking for ground, but Young said that may not be the case.
"We'll see what Ollie says. He's probably bred more as a 1600-metre, 1800-metre horse but you never know."
With spring on the doorstep, Young said it was unlikely Sunsource would head out for a spell.
"We can freshen him up ahead of the spring, keep him in the barn for a couple of weeks," she said.
"You put them out in the paddock, they end up getting the snots and that type of thing, so you're better off keeping them in the barn, nice and warm where you can keep an eye on them."