The POH for my 182 (Continental O470) recommends 2 to 5 mins running at 1000rpm after start in cold weather, and a check on oil pressure to ensure it remains normal during run ups. The big problem, apart from insufficient lubrication is, I understand, that if the oil is very cold and viscous the pressure relief valve may not be able to "dump" sufficient oil, the pressure rises to a level which burst pipes or joints leading to total loss of oil pressure - not good!
I generally ensure the oil temp is in the green before take off, on cold mornings starting the engine first and running for 5 mins very lean before I do the airframe checks (engine stopped!) generally means the heat soak from the engine has nicely warmed the oil on restart.