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Very simple , the breather system has clogged up . The moisture caused by cool running temperatures does not get drawn through the air box & burnt . This leaves water building up in the cam cover area . You then find this yellow / white / shite brown mayo looking gunge . Short winter journeys are the biggest vause as the engine never gets hot enough to drive off the water . The gunge can also cause pressure to build in te engine & force oil past valvew stem seals & you burn oil , stuffing your catalytic converter . At worst the engine runs dry of oil & all the bits stop very suddenly ( oh dear ! ) . If i remeber correctly the seperator sits at te back of thehead & has a hose that joins the airbox . Clean them all out , amke sure the mesh in the seperator is shite free as it can build very quickly if you only wash away the mayo . better still replace the seperator & clean out ALL of the mayo . THEN enjoy a long drive to really heat up your motor & drive off the remaining moisture in the engine . Oh and make sure the thermostat is working , if the engine takes for ever to get hot & very little heat is felt with the blower on full , you will always get mayo , vauxhall & hilmans were prone to this malady ( Now i am showing my years of experience ) BUT check the breather system first , it si the easiest to get at / clean & check out

have fun , i know i would ( not)

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Q: Why is their sludge in the breather of my vw polo air filter?
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