Alex Hales scored 155 not out as Nottinghamshire declared on 356 for eight after the Bears set out hoping to quickly bundle their visitors out and enforce the follow-on.
Hales and Chris Read scuppered those plans as Nottinghamshire reached lunch on 322 for six before they surpassed the target meaning they would not be sent straight back on.
Warwickshire began their second innings and declared on 86 with three wickets down, Jim Troughton top-scoring with 35, as the match petered out into a draw.
Warwickshire are now 22 points ahead of Sussex, who are inactive this week, after their lead only grew marginally with the three points for the draw and two bonus points this afternoon.
Worcestershire's survival bid took another blow as they crashed to a five-wicket defeat by Middlesex.
Toby Roland-Jones (five for 46) completed a 10-wicket match haul that left the Pears all out for 186 in their second innings, setting Middlesex a target of 204.
Joe Denly (48) top-scored as the visitors chased down the required total in 45.1 overs to score 22 points.
Champions Lancashire moved from the bottom of the table thanks to the seven points earned in the rain-affected draw against Durham at Liverpool.
Durham were bowled out for 416 with Paul Collingwood top-scoring on 114 as Simon Kerrigan did the damage for Lancashire with figures of four for 128 from 44 overs.
Surrey also played out a draw against Somerset at Taunton to leave them just above the drop zone.
Arun Harinath fired an unbeaten 105 and Kevin Pietersen scored 58 as Surrey declared on 360 for five at the end of the final day.