This is for a friend and I cannot seem to find any relevant, reliable, or referenced information on this: After coming home from a dealer, the first oil change on my buddy's RZR 570; the oil had a green tint to it. Polaris oil is not green. There is no evidence of coolant contamination other than milky residue on the bottom of the oil filler cap. That residue has not re-appeared since the oil change. Internet rumor has me believing condensation from frequent short runs can cause the oil to appear green. Has anyone heard of this?