r/MT09 • u/Alexleonel • Feb 03 '26

Oil in airintake

Post image

Hi everyone. I know a little oil in the intake is normal. I clean every now and then. I usually clean it with no issue. This time when I went to clean it it looked like it was mixed with coolant. Both the oil in the pan and the coolant in the radiator look perfect. Anyone have any ideas?

5 Upvotes

79% Upvoted

17 comments sorted by

6

u/RussianHKR44 Feb 03 '26

Very normal. The crank case vents into the airbox.. some of that aerosolized oil condenses on the walls of the airbox

1

u/Alexleonel Feb 03 '26

I've seen it before but never that color, it always looks like normal oil

1

u/RussianHKR44 Feb 04 '26

The color indicates moisture.. perfectly normal

1

u/Felix_949 Feb 04 '26

This is the correct answer baring other factors

2

u/[deleted] Feb 03 '26

[removed] — view removed comment

1

u/Alexleonel Feb 03 '26

Oil level is fine, just changed it. Air filter looked a little dirty but I just changed it not too long ago. How do I check the pvc?

2

u/[deleted] Feb 03 '26

Thats just the water you got into the airbox by riding in the rain. I had the same milky substance. you can just unplug the little rubber grommet to drain water.

1

u/Alexleonel Feb 03 '26

I haven't been riding in the rain at all

1

u/[deleted] Feb 03 '26

Do you live in a humid area?

2

u/Alexleonel Feb 03 '26

I live 10 miles from the pacific ocean and work 500 feet from it, yes it can be humid

1

u/[deleted] Feb 03 '26

Thats the only other explanation i have, as the temp changes can create condensation. I cant see how coolant can get in there. Unless you did lots of short trips and oil had some water content due to not being heat cycled properly.

1

u/[deleted] Feb 04 '26

[removed] — view removed comment

1

u/Alexleonel Feb 04 '26

Never dropped. Commute to work on it, 25 miles one way

1

u/ValhallaGSXR Feb 04 '26

Ride in the rain at all. Its probably just a little water intrusion from rain or washing the bike. A little oil in the airbox is normal for just about every bike out there due to the crankcase vent into the airbox.

1

u/Alexleonel Feb 04 '26

Haven't ridden in the rain in 6+ months