Treviso added their first points after 24 minutes with number 7 Alessandro Zanni scoring a try and Marius Goosen converting.
The second half was a quieter affair and it was the 63rd minute before Keith Earls added his second try, with Donnacha Ryan also crossing the line just before the final whistle.
Once again the boot of O'Gara kept things ticking over as he added 2 penalties and 3 conversions, with Warwick kicking the final conversion.
Munster come away with 5 points after today's 44-7 win over Treviso.
Munster: P Warwick; D Howlett, K Earls, J de Villiers, D Hurley; T O'Leary, R O'Gara; W du Preez, D Fogarty, J Hayes, D O'Callaghan, P O'Connell; A Quinlan, N Ronan, D Wallace. Replacements: D Varley, T Buckley, J Brugnaut, D Ryan, J Coughlan, P Stringer, L Mafi, I Dowling.