So i changed my oil on one of my yota's and all around the oil cap and threads in the valve cover was this yellow substance, It was some foamy high golden yellow crap.I use 10-30 synthetic, Ive never seen anything like this.Ive a BHG has a weird oil color...Could this be it..I'll post a pic if need be.

I'm not sure in a Celica since I'm not sure why it happens but I do know some of the new Tundra's do that and it's considered by Toyota to be normal.

relax I know exactly what your talking about, it almost looks like the foam on a latte. my car had this when I first bought it with 68k on it clock. I almost had a heart attack because I thought it was coolant entering my oil somehow ( assumed head gasket was shot). But a compression test was within spec and there was no white exhaust under full throttle and after a few oil changes using mobile 1 10-30 It went away. My guess is that moisture gets into the crankcase somehow. Maybe through the evap system? or faulty pcv valve. Come to think of it, it went away when i replaced the pcv...

normally cause my moisture in the oil. (ie water mixing into the oil)

Shouldn't be a big deal unless there's lots of it. Chrysler's have a HUGE problem with this "foam," especially in their trucks. They even designed the filler tube now to have a cover in it so at first glance it looks normal, but pull that out and it looks like vanilla pudding.

Ahh....ok, Yes thats def it., ya i tanked my coal canister and i have a unplugged tube coming from the valve cover, That must be it.

it sounds like an air compressed oiler was used to put the oil in cause its what happens to me at work when we dont have enough oil to air ratio so it gets all foamy. but the air is just used to push the oil out so i dunno what it is just my two cents