Oxford 3rd gained some breathing space at the foot of the Division 5 by beating fellow strugglers Stanton St John Willows by 69 runs.
Miles Picknett hit 82 in Oxford's 246-8, made after they were inserted. Then Alf Symons took 6-57 as Willows were shot out for 177.
Oxford were docked five points for failing to provide an umpire.
Oxford 3rd 25pts, Stanton St John Willows Shipton-under-Wychwood 2nd lost top spot after they were on the wrong end of a draw at home to Banbury Twenty 2nd.
Robert Hastings struck 95 as Twenty made 251 before being dismissed off the penultimate ball of the final over.
Shipton were never in the hunt as Phil Densham took 4-14, but the last pair survived with the score on 151-9.
Shipton-under-Wychwood 2nd 16, Banbury Twenty 2nd 19.
Jonathan Cooke (56) and Jamie Briggs (40) led Banbury 3rd to a three-wicket home win over Aston Rowant 2nd.
Peter Roberts had hit 49 and Paul Plumridge 48 in Rowant's 160 all out, which also featured fine spells from Ian Adams (5-24) and Sean Cranley (4-13).
Banbury 3rd 30, Aston Rowant 2nd 14.
Andy Haynes took 5-14 for Oxford & Bletchingdon Nondescripts 2nd as Thame Town 2nd were bowled out for 134.
Tim Rayden then struck an unbeaten 66 as Nondies cruised to 136-2 from 32.5 overs.
Thame Town 2nd 7, Oxford & Bletchingdon Nondescripts 2nd 30.
Crispin Andrews's miserly spell of 4-20 off 12 overs helped set up a four-wicket win for Leighton Buzzard Town 2nd at home to Bourton Vale 2nd.
Vale were bowled out for 158 despite Stuart Hughes's 41, and although Town lost wickets in reply they stayed well ahead of the required run rate and got home in the 38th over despite Tony Alderton's 4-54.
Leighton Buzzard Town 2nd 30, Bourton Vale 2nd 12,
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