Five star performance from the Nurserymen
Sam Parrish fired the Nurserymen ahead after just three minutes, before Jordan Appleton made it 2-0 four minutes later.
Appleton bagged his brace just before half time, while second half strikes from Nick Bines and Vinny Shrieves completed the rout.
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Hide AdThe result means Olney sit fourth, with games in hand over two of the three teams above them.
New Bradwell St Peter remain in the top five of SSML Division 2 after a 3-1 win over Tring Town.
Tommy Cooke was the hat-trick hero for Old Bradwell as they beat Mursley United 6-2 to go sixth, leapfrogging MK Gallacticos, who picked up a very good 1-1 draw with St Neots Reserves.
Ben Dickens bagged a brace for Unite MK as they saw off Tring Corinthians.
And Clean Slate reached the semi-finals of the Division 2 Cup after beating Loughton Manor on penalties. The match finished 2-2, before Clean Slates won the shoot-out 5-4.