oil window sludge

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Darren

Pack Dog
Joined
Feb 7, 2008
Messages
73
Reaction score
0
Bike
Kawasaki KLR 650
recently i noticed a brown mark on my oil window. it disappeared once the bike was running. new oil was put in 2000km ago at its 23000km service. my bike is an 08 klr650. any technically minded dogs know what this could be? should i just change the engine oil?
 
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