Yellow gunk in oil filler tube

I opened up my oil filler tube today, for the first time in a few
months, and noticed a huge buildup of this nasty yellow gunk. The car
has been running great, and is only about 2,000 miles on the mobile 1
10w30 synthetic oil. Anybody have any idea what this is from, and if
it's a problem? Oh yea, it's on a 76 fuel injected beetle. Thanks.

it's water, the engine is likely running too cold. Does it have an
operational thermostat?

John
Aircooled.Net Inc.

> wrote in message
oups.com...
> I opened up my oil filler tube today, for the first time in a few
> months, and noticed a huge buildup of this nasty yellow gunk. The car
> has been running great, and is only about 2,000 miles on the mobile 1
> 10w30 synthetic oil. Anybody have any idea what this is from, and if
> it's a problem? Oh yea, it's on a 76 fuel injected beetle. Thanks.
>

I think the thermostat is operational, I'll have to check it to make
sure. Do I just look at the thermostat when the engine is hot to know
if it's working?

wrote:

> I think the thermostat is operational, I'll have to check it to make
> sure. Do I just look at the thermostat when the engine is hot to know
> if it's working?
>

I'd look at it COLD as well... and make sure it looks different between
the two

nate

--
replace "fly" with "com" to reply.
http://home.comcast.net/~njnagel

Nate Nagel > wrote in message >...
> wrote:
>
> > I think the thermostat is operational, I'll have to check it to make
> > sure. Do I just look at the thermostat when the engine is hot to know
> > if it's working?
> >
>
> I'd look at it COLD as well... and make sure it looks different between
> the two
>
> nate



When the thermostat is open (the engine receives full cooling), the
thermostat bellows fills the whole bracket. When it's cold, you can
fit your finger in between the thermostat and the top of the bracket.


The reason for that yellow mayonnaise-looking buildup can also be that
you never drive long distances. The engine needs to warm up to normal
operating temperature, and STAY there for a fairly long period of time
(30 minute drive at least) for the water to really start evaporating.
It would help if your crankcase breathing system is open and
operational (carburator sucks in air from the crankcase via a tube
that conencts the case with the aircleaner, and fresh replacement air
enters from behind the crank pulley)

Jan