Start bike from cold with radiator cap off - look for constant flow of air bubbles Or, if you more mechanically minded then the best test is a leak down test but milky oil nearly always means head gasket needs to be replaced
Without seeing it is hard to diagnose but only other thing could be old clutch plates - these too can color the oil when old or worn out. Puts a silvery tinge or turns the oil completely grey to look at if really bad
good luck - regards Jamie
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