Coolant in the oil?

I recommend you replace the PCV valve and be warming up your vehicle properly before you move it-caused by moisture.

If not condensation could be coolant leaking into the crankcase

If it's only showing up on the cap it's only condensation and nothing to worry about.

WHAT YOU ARE SEEING PROBABLY LOOKS LIKE "WHITISH" OR "YELLOWISH"!

COMBUSTION PRODUCES ALL KINDS OF GASSES, TO INCLUDE WATER VAPOR

"BLOW-BY" IS WHERE SOME OF THIS STUFF SORTA "GETS PAST" THE PISTON RINGS AND "SEEPS" INTO YOUR CRANKCASE (IF WE LIVED IN A PERFECT WORLD, THIS WOULD NEVER BE ALLOWED TO HAPPEN!)

BUT IT DOES, NEW OR OLD ENGINE, THE MORE WEAR, MAYBE THE WORSE BLOW-BY IS

YOUR POSITIVE CRANKCASE VENTILATION (PCV) REMOVES THE GASSES, THEN SORTA RE-BURNS THEM, AS SOME OF THESE GASES ARE CORROSIVE (THE WHOLE REASON, THE PCV IS THERE, IS TO REMOVE THEM)

INSURE THE PVC SYSTEM IS STILL CONNECTED CORRECTLY, MAKE SURE THE PCV VALVE OPERATES (IT'S SORTA A TUNE-UP EXPENDABLE ITEM, THAT MAY BE OVERDUE ON REPLACEMENT)

THE SOURCE FROM WHICH THE VACUUM COMES FROM, COULD BE PARTIALLY BLOCKED, AS IT ENTERS TE MANIFOLD. ON MY JEEP, THIS WAS THE CASE A LONG TIME AGO, I HAD GOOD VACUUM ON A GAUGE---JUST NOT ENOUGH FLOW. THERE WAS GRAYISH/ SILVERY BUILD-UP IN THE "N. IPPLE" AT MY INTAKE MANIFOLD. AFTER CRUNCHING IT OUT, I HAD TO READJUST THE CARB. IT WAS GETTING CORRECT AIRFLOW NOW, IT HAD BE ADJUSTED EARLIER WITH THE WRONG FLOW OF AIR. THE "SNOT" SOON DISAPPEARED FROM MINE.

CAN YOU HANDLE IT, OR DO YOU MAYBE NEED DIAGRAMS OR SUCH?

THE MEDIC

If you have foam on the cap, it is condensation, nothing else. Blowby has absolutely nothing to do with it. Please ignore the previous answer.

HAD TO WIPE THE SNOT OFF OF MY MONITOR

SEE THIS

http://www.youtube.com/watch?v=c1Jb_sfpZsI

THE MEDIC

It could be either. Keep an eye on the coolant level to determine if it is going low. Next, try replacing the PCV to eliminate condensation. Finally, expect around 600.00 for a headgasket.

Again. PCV and/or blowby have absolutely nothing to do with moisture or coolant inside the filler cap.

DO AS YOU WISH

WIPE THE SNOT ON YOUR PANTS LEG AND DRIVE ON, AS SUGGESTED

. OR INVESTIGATE WHY YOUR TRUCK HAS SNOT AND EVERYBODY ELSE'S DOES NOT

I ONLY TRY TO HELP, AND GIVE OPTIONS

THE MEDIC

There is no such thing as "mechanic in a can". All those additives will end up doing is plugging up the rest of your system. I'll say again, the guy posting that stuff about PCVs and blow-by is not a mechanic and way off the mark with that advice. If you truly have a blown head gasket, which I doubt, you need to remove the head and repair it properly but it requires a lot mot testing first to find out if that is even the case.

It depends on the engine. If coolant passages go through the intake, as they used to do on V-8 engines, a leak could occur between a coolant passage and an oil drain-back hole. There would be no oil pressure there, but the coolant could get up to 15 psi and get pushed into the oil passage.

Hi there,

check the tops of the pistons for wash, that is the carbon deposits on the piston are washed clean, this is a sign of coolant in that cylinder. The coolant becomes superheated steam and cleans the piston. Also have the heads crack tested as this is often overlooked.

Mark (mhpautos)