SupsChad
XS400 Enthusiast
I had 15w-40 in the bike before just for winter test runs. Decided to go ahead and buy Valvoline 20w-50 motorcycle oil in for the warmer temps now. But once I start the bike and it runs for a couple seconds, the oil becomes pretty foamy. Ive done some googling and what I have found is it could be coolant. Well its air cooled. Could be gas. I didn't smell any went I changed the oil and I sucked some up through the fill cap and again, no gas smell. Could be that its overfilled. But on the center stand the oil is between the bottom and top mark on the sigh glass. Only thing I could think of is condensation. It does turn a tanner color when running vs the clear amber color, but goes back to normal after 30min or so when off. If it is condensation, should I just let the bike run for a bit to burn it off?
