A4MZMRIZED

My 1.8T has a light mocha coffee looking settlement in the coolant reservoir. I replaced the plastic reservoir and the coolant, but the substance showed up again. I'm assuming that oil is getting into the coolant some how, but is there a common problem for this issue? Do I need to replace the Head Gasket? Thank you all for your input in advance, any input is greatly appreciated...

Merkin

something like this i'd like to see a pic of what you're talking about

mr.haributo

There was evidence of sediment in my old reservoir as well, but I would describe it as being terra cotta in color.

But how Merkin alluded to, a picture is worth a thousand words.

Denim'03

It sometimes takes several flushes to get rid of all the gunk.

2.0GT35

Any foam at the oil cap?

Audi Junkie

Check the oil cooler for sediments.

CO AVANT

Oil mixing with coolant = no good! Prolly blew your head gasket.

Audi Junkie

The oil cooler is a more common site for mixing.

CO AVANT

If oil and coolant mixed to the point that it's in his reserviour then all that **** prolly ran into his block and head. Me personally.....I'd take the head off regardless to access potenial damage to the engine and replace the headgasket. Not the cost you want to pay somebody else to do though if it's not mandatory...

A4MZMRIZED, have you taken out the oil from the oil pan to see if the coolant and oil mix got down there already? I would be surprised if it didn't...

Audi Junkie

I just worked on a 4-Runner w/bad HG. Took out drain plug and green coolant came out for 20 sec.