Oil Filters
The bike takes two oil filters. One is the same among all model years and one changed in 2012 and newer bikes. Symptoms of an 2011 filter on a 2012 bike is low oil pressure/oil pressure light.
Source(s): 690 Hall of Wisdom
KTM Part Numbers
All model years need the "long" filter: 58038005100
In addition to the "short" filter:
2008-2011: 59038046144
20012+: 75038046100
Hiflo Filter Part Numbers
"Long" filter: HF155
"Short" filter:
2008-2011: HF157
2012+: HF651
Note: As of 4/10/13 the HF651 hasn't been found for sale anywhere. Word was that Hiflo would be moving that filter into production in March 2013 but it still hasn't arrived, at least in the USA.
Source(s): 690 Hall of Wisdom