foam in my oil filler neck and cap

hey guys i have a 2007 tacoma dc, prerunner. i went to change my oil last weekend, i used mobile 1. anyways i screwed my cap off to add my oil and had like a off white/yellowy foamy almost like lotion texture in my oil fill tube and cap. my oil looked fine and was at the correct level on the dipstick. any one have any ideas
thanks guys

 

Moisture + Cold weather + Engine not up to temp = the frothy yellow gunk.

 

X2
Nothing to worry too much about.

 

THANKS GUYS, I DIDNT THINK IT WAS NOTHING MAJOR JUST MAKIN SURE

 

This one is rising fast in the rank of thread frequency.

 

I RUN 40 MILES ROUND TRIP TO WORK MON-FRI. I CHANGE MY OIL EVERY 5K USING MOBILE 1 FIGURED THATS SUFFICENT

 

Signs of short tripping.

 

no need to yell about it

 

^^^hahaha ...It's common with the plastic filler neck too.

 

Bought a used Taco 4x4 DCLB that had 116,000+ on it. My first oil chnge on it was at 120,000 put Mobil 1 in thinking I was going the extra mile. I have checked the oil level a few times and the level seems to hold solid as a rock and the oil looks fine. The other day I was looking around under the hood and unscrewed the oil filler cap to look inside. Holy crap I about had a friggin heart attack when I saw this cream colored peanut butter had filled the underside of the cap and was coating the inside of the filler neck to a couple of inches down from the top. Thought for sure my head gasket must be gone. Dug out the goop and checked my dipstick, it was fine. checked my radiator level, it was fine. Warmed it up and watched the exhaust for excessive steam, it was fine. Truck runs fine. Jumped on Taco World and saw this thread and others like and figured I didn't need to jump off the roof. But I will keep an eye on it. The goop that was in the filler neck wasn't just foam it looked like baby crap.

 

Mine has the same thing, 9K on a 2008 I really don't get a chance to drive it long distance. I'll need to get it out on the open road.

 

nobody said it yet, but CONDENSATION