NHRA DIAPER RULE CLARIFICATION
As per the NHRA Division 1 Field Office any Raceway Park Sunoco Super Challenge Points Series Racer that participates in Super ET and/or Liftec Pro ET and has a race car that goes 9.99 and quicker MUST have an Oil Retention Device. This also goes for the Summit Racing Series event at Lebanon Valley Dragway in September.
This rule can be found in Section 20 Page 8 of the 2013 NHRA Rulebook.
NOTE: A word of advice to any other racecar that goes 9.99 and quicker...be prepared for the rule to include you in the very near future. Thank you.