Does Seafoam leave residue under oil cap?

[TekMan05]

Because I've started to get real worried there was some anti-freeze leaking in with my motor oil. But Then I started checking my coolant levels which was fine. My truck also doesn't over heat nor does it smoke proficiously out of the exhaust. Most of the time there little moisture droplets on it and sometimes a whitish substance. I added some oil in the other day and after driving a while there was a little bit more of this white substance on my oil cap and filler tube. I did seafoam my truck about 2,000 miles ago. Is it possible that there is still some gunk left over from there that may be causing this??

 

[aldive]

Its never been an issue on any vehicle that I have used Sea Foam.

 

[Cobraguy]

Does it look like a milkshake? That is moisture in your crankcase and MUST be dealt with asap. There are a lot of nasty things that can happen if you don't. However, it doesn't necessarily indicate a cooling leak. Moisture in the crankcase is normal through condensation. What normally happens is the engine oil gets hot enough to boil the water into vapor and the PCV system removes it from the crankcase. During this time of year especially, many folks don't drive their vehicles long enough distances to get the oil hot enough to boil off the moisture. Also, you need to make sure your PCV system is operating correctly...that the valve is good, vacuum supply is correctly routed and not leaking, and that it is drawing in air from the breather as designed and no place else.

If all this is good and you are driving long enough distances, then it's time to look at coolant leaks. Intake gaskets, head gaskets, etc.

 

[radman]

May not be hot enough?

Also engines being operated in cold weather with a thermostat that is not fully heating up will cause the same moisture condensation concerns. Most engines in our cars and trucks use 195* stats, have your coolant operating temp. checked.