oil or no oil?
I have seen dirty oil windows on many bikes. Seems to come from certain types of oil which build up brown or black residue on the window and make it near impossible to read the oil level.
On my own bikes I use quality oil (Caltex Delo Gold 15W40 or Total Quartz 9000 10W 50) and all the windows are spotlessly clean and easy to read.
Assuming that you have a KLR you will have to take the clutch cover off and clean the window (for ex. with carb cleaner). Using quality oil and changing according to schedule will avoid future problems.
Taking the clutch cover off and cleaning the window is a lot cheaper than rebuilding the engine.
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