Today I was changing the oil, filters, etc....when I noticed a oil color difference in two alike liter bottles of Motorex? I use Motorex Top Speed 4T 15W-50 which meets the JASO T903 MA requirement in the owners manual. I use this type as my dealer doesn't carry the Motorex Formula 4T and the first time I changed the oil they checked with KTM and said Top Speed 4T was good. Anyways one liter was green color as I am accustom too, but other liter bottle of oil was light brown color. Anyone seen this before? I'm gonna e-mail Motorex with this question and lot numbers off each bottle.