Question about Cars & Trucks
Noticed light chocolate colored oil on surface of oil cap. similiar to a milkshake.
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Posted on Jan 02, 2017
SOURCE: Low coolant
"I assume the chocolate color is an indication of maybe not water leaking into the oil?"
I'll lay $5 on it's being coolant :-)
As for the "overflow cap" or expansion tank filler cap as I would call it, in the absence of a VW engineer telling you different, I would leave it loose while the Stop Leak was taking effect, just to avoid forcing the Stop Leak into the oil system as the coolant system pressurised. If the can says "...works in ten minutes" then you could tighten it after that time.
Be sure to check the coolant level soon afterwards to find out if it has worked.
If the Stop Leak doesn't... I'd recommend getting a mechanic to find the leak and fix it. Left to themselves, things go from bad to worse.
Good Luck, D.
Posted on Jun 30, 2008
SOURCE: Head Gasket?
an emulsion build up on the cap can only be caused by water. the question is how the water is getting in, mostly likely head gasket. are you having to top up your cooling a lot?
Posted on Oct 05, 2008
If forced to guess, I'd have to say head gasket...but, could be cracked head also (can't really tell unless you tear it down, but to do the repair, either way that's what you need to do.) If residue was reddish, it could be the trans cooler in the radiator but it's not, so rule out radiator. Make sure you flush out system and change hoses during job ... oil softens them and makes them prone to failure. Even if head does not appear to be cracked, have it checked for warpage, sometimes they twist when overheated. Cracked blocks are rare...I would not be concerned unless engine was frozen during winter.
Posted on Apr 15, 2009
SOURCE: Engine oil moisture
Known issues or not,It sounds like the head gasket is blown,or it has a cracked head.If it was water it would be thick and light grey in color on the dip stick,But yellow indicates antifreeze leak that has not had time to mix with the oil.
Posted on May 20, 2009
We just went through the same thing on our 1997 SC1, replaced the head gasket and the oil in the coolant issue persisted.
Pulled a cylinder head out of a 1995 wagon and put it in, the problem has cleared up after a LOT of flushing with powered automatic dishwasher machine detergent and water. We also replaced the upper and lower radiator hoses, thermostat and water pump once the flushings were complete.
Posted on Jun 19, 2009
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